406 vs 421 sbc for boost specs forum. all old nascar parts.

406 vs 421 sbc for boost specs forum Both are 10. 3 solid rollers and the last one was a hydraulic roller. 0 compression, efi, procharger F1 (cog) set up to max out at 7000rpm 70000 impeler rpm, lets say the big block peaks at 15 psi of boost, now the sbc, 383 good roller, 9. It's a 509 block engine. 7000rpm, has to be Hydr. With the Eagle Stroker Kit witrh the Stroker rods you can run a standard base circle cam also. I wouldve thought a 750 wouldve been big enough but for reasons beyond me the 850 is better on the software dyno. he wants to go with comp cams solid As part of the rework on my 406, I've decided to go with a hydraulic roller cam this time instead of the solid roller I was using. With big heads and a roller 6000 isn't enough closer to 7000 is more like it!!! Example: On our nitro engine with 4. The 195's are said to flow 260 now and 280+ when the updated version comes out. Intake will be the Victor JR for this set up (I'm 100% sure) there will be a 1" nitrous plate between the manifold ant the 950 Hp Holley carburetor. Conventional lore has it, 1000 lbs. 312 and . The 421 3. Eric . 31 12 bolt "I would rather have questions I can't answer than have answers I can't question" :R. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance steve cowan wrote:x2 with warp speed,i use and have used on my bbc and my current sbc 0. 032 top,. No vacuum or check valves to worry about A forum community dedicated to Chevrolet Chevelle owners and C3 Tech/Performance - 383 vs 400 sbc - I built a 383 with hydraulic lifters, flat tappet cam, and vortec heads last fall. 406, 421 or 434 Sportsman Series Drag Race Short Block: $6995: Drag Race Engines Econo Series - SBC: 427/640HP Econo Series Drag Race Engine: Supercharged Long Blocks - SBC: 406 Power Adder Long Block - Stage I, II or III: From: $13850: 434 Power Adder Long Block - Stage I, II or III: From: $13850: Joe probably has more experience with the 406" than anyone, but all thoughts welcome. standard weight, my rodes are eagle H-beams BST (6. I don't know if i need or not a small base circle cam. You can even get a crate 502 for a little more. The cu in difference would be worth about 22 lb ft of torque, all else considered. 73's 1000-hp sbc 400 vs 1000-hp 496 bbc-procharged chevy test? what happens when we run the same f1a-94 supercharger, with the same pulleys on a modified 400-inch As far as what pump to go buy, I thought the new Milodon pump (same casting as I use) showed good promise but this "doesn't fit" problem is troubling. I'm just being a jerk That's all. 6 ratio rockers ,victor jr. That would be a 427 The swept volume of the 421 is such that it would still maintain velocity with a larger port. Subscribe going with a 1. Nice that a smaller head can do almost the same. i have one on my 406 and notta problem yet. My interest is on the Hydraulic Roller Voodoo Retro-Fit Lunati 20120711K (60111). There's a Magnum hydr roller,. 700. Multiple parts shipped via freight in an order may increase the total shipping amount. I can't see 650 being a problem at 421 cubes . Cam specs:-RPM Range: 1800 - 6000-Lift: . C4 Tech/Performance - AFR 245 SBC head flows 350cfm - I just got back from the SEMA show. If you end up going with the 400, I would recommend going with a dart block for $1500 it is hard to beat! as briefly mentioned you can make a 406/421/434, etc out of it and creep into the 600hp range. I previously built a couple of 406's that were 9. The lift is intake . I wanted to use my exsisting headers ect. 9 inch,lots of Duct tape. Well, no big secret SBC's are lighter. OR World Sportsman II heads straight out of the box, Holley 750DP. 64cc chamber. As per Lingenfelters SBC book "why build a 383 when you can build a 406" (,030 over 400) for the same money and get 23+ cu. so I sold off one of my 383 projects and another member got me interested in both a 406 and a 421 SBC for my 2 projects. A forum community dedicated to all Chevy Nova There comes a point where you get less of an increase of power. It's a weekend TOY that will also spend time at the dragstrip. 050-inch lift The 406 sbc with vortec heads makes BBC torque even in the low rpms. Most single plane intakes I think have to be drilled for a vacuum port for power brakes. Our short blocks are in high demand among racers of all types worldwide. 5 to 1 compression ratio-- race gas only because octane boosters are a big scam(if it says it raises octane 5 I’m building a long rod (5. 7. 5 to 1 comp, 220cc heads, and a 250-ish duration hyd roller made 640. I forget the cam specs, but You have a good start on a good running motor. 3. 028 second. They are 238cc runners from Weingartner Racing. all old nascar parts. 420 lobe I can get away with a 1. 540 solid FT cam, and junk Edelbrock 200cc etec vortec heads. car . The 500 hp SBC will be a little hard to live with unless you are hard core hotrodder. If your 3310 is an early one with downleg boosters, use it. 00). I have also thought of doing a 400 block with 350 crank for a 377. Forums. hi all- im new to the forum and am currently in beginning stages of a 406 sbc build for my 1970 corvette. I have ran -7s in an 18 degree 421 SBC with 15. Same thing everybody else has said, NGK-8 on motor, and NGK-9 if your going to spray it with alky. The 421 has a 3. The AFR 210's are gonna flow 300+ compared to the older versions. The pistons are TRW/Saaled Power units with aftermarket rods (stock length) if that helps. Wonder who has built one and if they'd do it again. 77 Monte 421 Profilers ported by Eric Weingartner, Straub HR 3200 conv. Engine Specifications Hmmm, good question. 125 bore,the gap is . 0 Dec 9, 2007 | 04:13 PM To 406, 415, 421 or a 434 Stroker. Join Date: Dec 2011 383 or 406 sbc. 6" valves. SBC 406, has run a best of 6. 60 and lots of work. I have friends who swear by the 427 SBC, whether they built their own, or bought a crate With a 70 nitrous jet and a 62 fuel jet plumbed in, for an expected 150 horsepower boost, the bottle was cracked, the solenoids armed and the engine started. 125 compression height, 421 uses a 1. From actual dyno runs: The 400 sbc that I mentioned above is make 477 ftlb at 2500 and 525 ftlb at 3500 rpms. so it boils down to your wallet. The original plan was to have my current sbc 355 built to a 383. 400 inches of valve lift have taken place (see Fig 1). 2nd. Steve Land Jr. Ive got a 406 chev, RPM air gap, AFR 195 heads, TKO 600 in a 3400 lb car and im looking at the Holley 850 street HP carb. Afr 220 406-421 sbc is a tried and true street combo with hyd roller. 659 ext) (dur @seat 316int 320ext) (LS112) AFR245 unported heads with LGM My friend is building a 377 and I am building a 406 and here is some info on both My 406 Forged bottom end 10. 75 vs. Give me some input as i would like to know how much more torque that the 406 will have vs. Welcome to the site. it’s bad ***, but, it’s right at the edge of daily streetable. 75" in fact the first 383s were simply 350s with a 400 crank installed in the block after a . Jump to Latest been looking into this also as I have built some 406 and 408s that did real well. 040 head gasket always worked good for me. 73's 406 SBC M21 3. how much hp i can safely? ill use Pump Premium and Race fuel too. 500 with the 1. 125 bore) Forged stroker assembly, to bring it up maybe 421-427cid I have a 9"ATI converter that flashes 4500 with the current 9. Plan is pump gas compatible street strip deal. Superchargers you change the pulley and thats the boost you get. I was told that spraying on this rod and crank combo is a very bad idea my question is, can I make 900 or so hp. A 421 needs a stroker crank which costs money. Can go. 125” bore. 530" Thanks for your words. I know, and knew, it is a 421. Its a complete virgin block, never been bored or undersized. 00. 125/1. 617 isky cam, with a set of old Pontiac 867 sprint cup heads. lifters for ease of use and not needing to set lash all the time and 23 degree heads for standard part compatibility. 5 comp,xe274 cam,edelbrock rpm heads with 202 intake valves,air gap manifold 750 carb, they dynoed 428 hp@5100 and 468ftlbs @4200 I built a 422 sbc using a stock block. 570/. Pretty minimal difference between the three isn't it? 1/16" per change. 7 or 6. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more! 406 sbc build need cam advice. a lot of kits with the 6" rod. The 653 was at 24psi and building 388 sbc and have a question about cams in general, cam has rpm range of 3700-7000, how does the cubic inch of a engine change the rpm range of a cam, iam not talking about idle quality or drive ability but where the cam makes power. 07 @ 131 - 6. 10 gear 421 SBC CR, Dynamic CR & Cam timing. I dont think that would break the bank too bad. Come join the discussion about restoration, builds, performance, modifications, classifieds Ok I have already a lil m dart block I'm no mechanic so I'm reaching out to you guys to get all the specs needed as this has been a hard topic to find information on, there is limited stuff on YouTube or google on building a 421 sbc. I would suggest a 406 if stuffing in a stock front in of any car. 622" with 1. Look for a "509" or an its hard to find a good old 400 sbc such as 509/511 castings. 6:1 compression ratio, AFR 210's, and the engine is going to used for a 3000-3200lb manual transmission fun street car with some track use. Custom Sheetmetal tunnel ram intake for single 4500. I would buy the right size carb now. The Fora platform includes forum software by XenForo. The Fora platform includes forum software by A 383 has a 400 crank as you know. Although timing can and will vary between builds I am running 38 degrees (total) on C-12 at the track and about 35 degrees (total) on pump gas on the street. You can get a crate 454 that will make 450 hp easily. this makes the stock efi to deliver more fuel on boost. Thread Starter . A 350 eagle steel, and a stock 3. the ford turbo from a 2. chambers and flat top or D dish pistons and a tight squish/quench clearance is the way to get the burn improved and to increase detonation resistance without resorting to fuels beyond the low 90’s in octane rating. 20 years ago, we did a basic 406 with a 249/259 106 LSA solid flat tappet than ran 7. All make over 600hp on pump gas. Eric Weingartner Weingartner Racing LLC 918-520-3480 Utilizing a big bore engine block and a medium stroke forged crankshaft, this engine loves to rev! Using only top of the line components like a fully forged rotating assembly, hydraulic roller camshaft and aluminum heads, the 406" Eliminator is the engine your car needs. I'd buy another in a heartbeat, he got it done quick and shipped fast 406 SBC M21 3. SBC 400 - What do you guys think? Pro's/Con's? The 23 extra cubes of the 406 (a 400 block with a . I run a 408 SBC in Pandora's Box which is similar to your 406. the hydrolic is no maintence perfect for street, solid , valves have to be re-checked periodicly, cant C3 Tech/Performance - 406, 415, 421 or a 434 Stroker - What do you guys think? I have a 511 4-bolt block being cleaned/mag'd & pressure checked. Even at 0. HOWEVER, let me introduce the combos I am considering: 383 cid - (350 Block) 4. A 670 Aven will limit a 406 depending on its spec's faster than the 750 will. . 4. On E85 at 7. Boost retard is 1 deg per pound of boost. I'm sure abit more head, more rpm with more cam can get near 700. I'll The 427 SBC is the holy grail of small blocks in my opinion. asbi street drive my car . BTW, Looks like runner of about 210 – 225 should be sufficient for a 406 – 421 (depending if I stroke or not). If your engine builder did not recommend a timing spec or if you built the engine then you will have to find your "sweet spot". specs: 406 10:1 Dart Pro 1 Performer RPM (newwas using Vic Jr) 1. 02" and 1. Great acceleration, torque and throttle response to have fun stop light to stop light. Save Share A forum community dedicated to hot rod owners and enthusiasts. Be careful of the lure of large displacement small blocks. I could have made the same or more HP around 600 with an LS, and it would've purred like a kitten and gotten better than 7-10 mpg. IMO the only reason to ever build a sbc using a 4 inch bore block is if you already have a 4 inch bore block. I'm not saying it would beat the comp on a dyno, solid vs roller, you know, but for the money, it makes a lot of power. I am mainly concerned about the 350 Block vs 400 Block strength and overheating issues . Model specific subject matter experts, classified ads and more. 875 Stroke. 08 posi 26 inch tires. [inpost_gallery post_id=2305 group=”1″] The Test Heads. 383 or 406 sbc. 4 to 1 compression Ported 200cc Brodix RaceRite heads (2. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos 406 sbc, 4. 06@111 in a 3250 pound car. I have a progressive controller and our machine shop thinks it will live with the progressed nitrous but what about if I make it a 421? The Fora platform includes forum software by XenForo. Heads are Dart pro 1. 421 is a good n/a and nitrous . 67 @ 157 A forum community dedicated to drag racing drivers and enthusiasts. 8-1 cr. I think roller rockers will work good for you. If I don’t spec you a cam go with jones. 63 a/r exhaust turbines would be best for a 350 street engine (quick to boost). 875 stroke/6" Rod = 421:thumbup: an easier route is the 415 cid 3. Just doing the math, compression is worth about 2% per point. (about 406 cid for me) where a bigger and bigger SBC stops making sense and simply building a BBC starts to make more sense. I see that the 6" rod combo is the cheaper way to go . A 402 built by chevyhiperformance made 394 ftlbs at 2500 and 456ftlb at 3500. 1 @ 6300 its pretty bad when a little Dart 215CC 1-4 Barrell 434 14:1 can beat a 401SBC 2-4's SheetMetal Manifold 18deg 2. Lots of threads on the 400 needing better heads too. The 406 there was under 9K. 062, and 434 uses 1. 875" stroke. Pontiac 867 casting 23 degree sbc heads with 2. 1 cr . let me know when AFR has the specs-im assuming they will do a full port job like I Have a new 55 chev now,, And i Just built a new 406 for it also,, Full interior car, all motor no NOS and drive it ever day it went 11. 308 but good idea to check it For a conventional headed SBC with heavy nitrous which rod would be better 5. 21 posts · Joined 2016 #6 · Apr 13, 2016. Annular boosters just tune better. if youve got a 400 block you currently tend to build a 406 vs a 377 , the 377 used to be the better choice simply because in the past the only source for heads was ported O. 31 12 bolt Put together a 421 recently with cam specs almost identical with ported RHS 235 heads and had similar results. compression, and head specs on a 383 or 400 SBC that the benefits of the dual plane on the low end of the power band is just . Jump to Latest Here are the spec for The cam i already got and was wanting to stick in the 406 with the pop ups pistons, using 1. -VS a SBC 434 14:1 CR Dart Pro 1 215CC Heads 2. VerticalScope Inc machine shop tom wrote:I am freshening up a set of heads for a customer's weekend warrior AMC Spirit. That will determine what you need. I had this cam in a mild 383 with vortec heads in my first sbc. Check out our custom options and packages below I won’t build another big inch SBC myself, I dropped $15k on my current 421”,i bought every individual part, right down to the bolts. I picked up a 406 SBC on local Craigs List. 6 10:1 compression 1. 406 sbc questions. 6 roller rockers. 00) in. 406 SBC on E85 - 10. 73 gears, 750 DP, single-plane intake (Edelbrock, I don't know which one at this time). 50 and is a comps cam, and I know both the 227 and the 235 take shaft mount rockers. 616"/ exhaust . Re: Anyone do a 406 to 421 SBC comparison? Results? Worth the change? by RevTheory i would run the 406 for shorter stroke than the 421 that way you can get a better piston built that way you can put some boost in it . 6 in 1. I think I might also have the spec sheet for my bottom end My cam is a Comp Cams 280H: - 2000-6000 RPM A forum community dedicated to hot Check this one out. 185" bore). CNC-9360-E PART NUMBER I am aware of the 383 vs 406 Arguments . I’m interested in hearing your view and arguments of what heads Hi, I think that instead of going ls-style retro in my car, I'm seriously considering just building a sbc 400 that I have. Regardless of port volume all these heads flow about the same cfm until some 0. I'm needing around 750 horsepower to be competitive at my race track (super latemodel) circle track. casting, based cylinder heads, being available that could not effectively flow enough air to feed a 406 spinning up at 6500rpm, but in the last 20 years aftermarket Overview Building a high-performance 421 cubic inch small-block Chevrolet (SBC) engine that produces 700 horsepower is no small feat. 421 vs 434 sbc. These heads are probably really intended for 421 ci and bigger, But would work well on some really wild smaller cube motors. 3 liter t-bird may also work. Looks like a 406cid "clone" of an engine my buddy and I spec'd for a customer, albeit in 383cid form. 00? I know the ring package would be better with 5. , 111 406 sbc build. i am going with an eagle balanced bottom end rotating assembly, will be running , dart pro 1-215/72cc alum heads, torker 2 intake for hood clearance reasons and i so want to pull close to 6000 rpm as well, holley vac sec 750, msd dist 421 sbc heads. There are guys running around on 6-8 lbs of boost on very mild almost stock small blocks. M. 750" Stroke - 5. 08" valves and ported AFR's the 750 is too small i think. 875 with eagle 6 inch rods Diamond 8cc domes that should make it right at 13. 2 2016 - 8. out of one of these 6" combo kits? does any body run the 6" rod kits, with nitrous success? thanks for your time, and info. The 235's on my 450 are very responsive. I’m using Comp Cam’s XE262H with . 5 rocker does, and the heads flow well Put together a 421 recently with cam specs almost identical with ported RHS 235 heads and had similar results. 0:1 compression ratio depending on the combustion chamber and head gasket choices, so adding a lot of boost begs for race gas, taking the fun out of street thrashing. Bowl blended and guides thinned down as well. Vortech V-3 running 7psi boost, Dyno showed 702HP and a nice TQ curve Anyways Im curious on how to build a 421 SBC. 6 rocker arm Racingjunk Forums > Racing Junk Site > General Discussion > 383 or 406 sbc. Gets about 3-4 gallons to the mile. 750 400 crankshaft. Small Block, 708 HP plus nitrous 406 sbc,thumper cam. 615/. Straub technologies do 4 cams for me. 155 good bore 511 sbc 400 block, 2 cranks. The original discussion was on normally aspirated 383 vs 406, not about boost. The engine is a 406, with a Lunati 40139 cam (. We owe a favor to a good friend who wants us to build him a street 406" SBC, typical single 4-bbl, daily street driven. my pistons are wiseco FT a stock 400 and a 350 stroked to 383 have exactly the same stroke at 3. Moving 4,244 pounds of anything takes power. Henderson arrived at the specification of 246/251 degrees duration at . 6 rocker arm will boost the lift by 1. 406 vs 377 same compression. 406 SBC Build . or i go get 406/408/421 SHP Dart SBC all ready assembly. 85 vs. All our short blocks are 100% machined, CNC Machined and blue-printed to our race wining specs. )if thats your plan,street and strip. 7 or 6" rod 406 is all you need with a stock block, if your going to build for cubes, buy the dart block and build a 454 cid SBC now thats a stroker! 2wld4u best head for 406 sbc 14. 875 and 4. SHOW GUEST. 832 stroke 5. Choices I'm lookin at this time- keep the 406 and rebuild it, this time all forged and put in a retrofit roller cam or go with a roller block stroked 383. 68 cc chambers. This motor has AFR 210 heads,Comp Cam roller 440 lobes 1. i. is more streetable. It begins to get very pricey after you go beyond a 3. the 383( both motors built the same) I have heard that the 406 is a torque monster? True or false?The 383?? Thanks! Remember that the trans is a th350 and the gears are a 4:10. bowtie dry sump block, 4. 592, 264/274 @. 0, and on 3 88mm turbo. We've had many reports on this forum about pickups falling out or breaking The Hammer has between 10. 030 overbore like the 383) should yield a nearly proportionate power increase but I don't think it would be that noticible a difference unless measured on a dyno or at the strip. Turbos don't use engine power to make power like the superchargers do. Engine in a box. Junior Member. JoePorting Guru Posts: 3002 ↳ Forum Help / Questions / Tips; Classifieds; ↳ Race Cars & Parts - For Sale or Wanted; ↳ Shop Equipment - For Sale or Wanted; ↳ Other - For Sale or I tell people if your going to build a 400 or 406 bump up to the 421 for a street build its the way to go. I want a street/strip engine, with vacuum for my brackes. (in my opinion. Here's what I was thinking. First my engine is forged scat crank (4. Engine is a 421 SBC built with a Dart SHP block. shorter stroke less rotating mass. U will be in the ballpark of this. One of the best cam for bracket engines in your cubic inch range, and great for 327/350 engines at higher RPM's The Fora platform includes forum software by XenForo. Therefore a turbo making 6lbs of boost will have more power than a supercharger a 6lbs. 75 377 sbc? I've been considering building a 406 for my 57. and he did all the machine work. 800 or 3. Engine is built for boost and racing. With a properly built 383 you'll need more like 6-8 PSI for your power goals. 350 SBC, standard bore, 8. Melling and Moroso are selling higher priced pumps but there's still the issue with pickup installation for many people. 9 compression ,smallish roller . You will make 750FWHP by accident. I have had a 427 BBC, and it was awesome, but I feel the SBC is "raspier" and more responsive than the heavier BBC. I'll let you decide if it's worth it. 1st, 406 11:1 home ported stock valve size 062 Vortec heads Ported Super Victor, 1000 M/D Hyd flat tappet cam 1 5/8" headers Results, best of 10. 185 bore and 3. 00" stroke (427)(I will not consider a 4. And also basically maxed out the injectors which are 60lbs. Lower comp ratio=less cylinder pressure at a given boost which equates to less chance of General Q & A - 406 / 421 sbc builds - Anyone care to share their build experiences with a 400 small block chevy? I have several blocks available, thinking of building a GM block 406 or possibly a 421. They flow 325@. 462/. thanks. 155 bore 6" rods Dart Pro 1, 200cc intake, 72cc chamber, 2. My current 355 is 10:1 and I thought going up a bit in compression (mainly b/c that’s how this 400 engine is SBC: 3. If you don't have a 350 block now there is no advantage to the 383 over the 406. 580 lift (proven to rev to 7000 before floating the valves with this setup and same build engine "X" amount plus "X" amount for boost build 421 cube N/A engine about the same hp about the same price We run a Naturally aspirated 421 SBC in my daughter's 69 Firebird . My current setup is a 408 and has all the power and performance I need. 7" Rods Thanks for the replies guys and some great info. 000 base circle cam using a Callies rotator using the compstar rods. 406 12:1 home ported Dart 215 Iron Eagle (non-platinum heads) The COMP Cams CL12-212-2 Magnum Cam and Lifter Kit is an exceptional choice for a cam seeking reliable performance for a 406 SBC engine. I did it on a limited budget so it is by no means a high performance engine but it was a definite improvement over the crate 350 that the PO had in it. 050 . Here are three key benefits that make it stand out from other options: Improved High RPM Power: The CL12-212-2 Magnum Cam and Lifter Kit offers excellent high RPM power, making it ideal for those seeking a cam that can deliver Chevy Forums FREE technical assistance for your restoration and repair. After a fair amount of research and the lack of good, cheap 400 GM cores, I feel like doing an aftermarket block is the best option. will the rpm range change in a 327 vs 434 for example My build is a 406 small block chevy 249/255dur@. This is with 48 lbs of boost at 10524 rpms. I have 4. Rebuilt General Q & A - 406 / 421 sbc builds - 94Sylvan- I have never had engine on a dyno but an educated guess would be peak power at about 5500-5600 rpm. 469 lift and 218/224 degrees duration at 0. 155 bore x 3. " 377 vs 434 SBC?? I had pretty much narrowed down my engine combination to a 434 small block (4. 060 so what ever that translates to haha, dart flow tested the heads and recommended the 200cc bc of the car and the specs of the build especially since we went with oversized valves they said it 406 sbc cam. you might want re consider hydrolic roller cam, its only safe up to 6000 rpm iwent solid 7200 plus raiting, to many things can happen. when you increase the size of the engine and change nothing else. Jump to Latest Putting together a new sbc engine for a freind , 3. Sweet jesus. and that makes for a bad *** street engine Alot more 406-421-434 builds but I wanted to be differant. Currently I am I have several blocks available, thinking of building a GM block 406 or possibly a 421. in totally aftermarket form, BBC's can be had from the crate at 572 c. 8-14. vs. 020. 007'' per inch of bore for n20 and my junk still has 2-3% leakdown it is the cylinder pressure and heat that you have to consider,i know there are plenty of guys using high compression and a fair amount of spray as in your case so i suggest you creep up on it slowly hey Guys, I’m getting my 72 nova tune. Im putting together a similar setup, comes out to 398cu. 5 rockers Victor Jr (current, could switch to RPM Air Gap) A forum community dedicated to hot rod owners and enthusiasts. This camshaft with Dart 215's as cast on a 406 has been 5. Reply. Wieand 142 supercharger with 4-6 pound boost pulley; Holley boost-referenced carb; Holley 110GPM mechanical fuel pump; GM HEI dist. Even if I put a very mild cam in that 406 engine with an LCA of 112° or higher the engine would still scream with those heads. My 422 is based on a factory 509 casting and is fitted with Oliver caps 1-4 and a Mikej26 wrote: ↑ Tue Jan 14, 2020 11:01 pm Looking to build a new short block soon and seeing as I need to get a new block and rotating assembly anyhow I’ve decided to go with a Dart SHP block and a 4. E85 421 sbc almost done! a 215 should have been spec'd here or even larger. I like your plans. Easier fit since you don't need large headers and large induction like you need with these 3. This is not a thread about recommendations on I'm currently on the drawing board building a 421 SBC It will be used for strictly 1/4 mile (bracket) drag racing, 3100 lbs car, t-400, 6000 stall. 5 to 1. A forum member had me build a mild 406 for his 71 Chevelle, I thought I would post some pictures. Going from there I’m undecided on which direction to head regarding stroke. Dart Pro one heads 215cc 72cc Edelbrock rpm air gap Headers full lenght 750 cfm holley Th350 shiftkit 2400 converter 3. Like said tho, cam libe choice and a good lifter is needed to work at higher rpm. 066 times what a 1. in. May need more spring pressure than 155, shim to 175-180 would work depending what lobe lift is available before bind I ran those pac spring afr195’s to 7000 in a 383 sbc. 5 compression on alky, ran great, and started very easily. Tech / General Engine - SBC 421 dyno results - Finally got my sbc 421 together and put it on the dyno Here are the specs: 4. 5mph and in the high 10's the rest of the night. 6 dome Jones cam (lift. is a second on the 1320, so do the math. Lmus10 Member. 030", if at all possible . I am thinking about replacing the tranny and If you're building a motor to a power/rpm level that will require splayed caps on a factory block, just step up to an aftermarket block now. 406 SBC Build. 875 stroke, 421sbc nitrous motor 12-1 compression, 5. should yield a nearly a pair of 0. 70 SS Camaro, 454 Alum. 050” lift, along with 1. 200/1. 2 compression 406 with forged pistons and scat rods. Thread starter Lmus10; Start date Nov 14, 2016; L. 875 inch stroke, (415-421 cid). 50 ,520-540 lift,with a 108 lsa,and yhey call for double springs w/dampner,rates are ,132 If you set the 3 different pistons beside one another, 406/421/434 all using 6" rods, the 406 uses a 1. 904 lifters because of the smaller base circle cams. We use the best name brands such as Dart, Callies, Lunati, CP-Carillo, Eagle, Scat, JE, Diamond, Mahle and Manley just to name a few. This is the 421 I built, Pump gas HYD roller he wanted a torque Tech Help. 0 @ 7500 Peak TQ= 585. Thread Tools 08-20-2012, 05:05 PM #1 cs89chevy. The solids are in a 434, 421, and 406. Same comp but bit more cam . Little back story, it’s a 72 pro street nova sbc 355 with afr heads, edelbrock rolling thunder cam,fast xfi 2. 050, 106 sep, 102 c/l). But little hint you dont need 421 cubes to make big power a 406 wil make all the power you can handle if built right. 550 lift. i had seen one guy tried sell 421 Dart Little M with all forged and dome for $2500 Lots of threads on the Air Gap / Single plane talk on a SBC. 00" stroke engines. 750 installed height are 108lbs seat pressure,and 339 lbs open @ 1. I can upgrade down the road is short order. 75 stroke, 6 inch rods, srp domes 13-1 comp. I am looking to have a cruiser with good hp through a 200r4. Try gapping the second ring a little wider than the top. 5-11. Presently have a 406" dynoed 560hp. 850 cfm quick fuel carb with super Victor intake. 250 height 462 lbs spring rate , Comp cams on the othe hand has a similar grind,236-248@. 421 sbc & hp with similar specs. I don't spin them much over 7k RPM. VerticalScope Inc. Has forged pistons but have not gotten into the bottom end your running a better combo. 350 to a 396. Post: 421 sbc (Topic#332719) 498 chevy "15th Year" Platinum Supporting Member Posts: 527 Age: 73 Loc: hayward ca. Feynman 77 Monte 421 Profilers ported by Eric Weingartner, Straub HR 3200 conv. 280zx turbo or 300zx turbo first gen will have this turbine. 5lbs of boost non-intercooled I made 600hp to the rear tires blowing thru a converter and a 9" rear. 155 bore good street kit, the 421 is good to 6500 the 415 about 5500-6000 imo, a 5. 95% street use. . 4 to 1 CR and run fine on 91 octane at 2800 ft altitude. 230cc. 0,dart heads, again to match the cubes The 396 SBC stroker is rather in-depth to build, it requires more carefully checked clearance and clearance grinding on the block, definitely needs a stroker clearance connecting rod, is best built on the later roller block due to block clearancing concerns, and should have a special small journal rod journal crank and connecting rod just to This is a pretty big cam for a flat tappet. Some good Comp hydr roller cams would be the XR276HR with 1900 to 5600 rpm range with a 350, so take 200 to 300 off that for a 383. Which AFR 195 Eliminators were used, the Race Ready or the Competition port jobs? With a Comp Cams XR280HR cam on the Race Ready heads, our 9. 0 with a 10" converter and 4. 625 15:1 CR Combo !! so you need to be careful comparing any 383 vs 406 or 406 vs 434 or The compression increase of a small chamber head would with the cam you have would build up the bottom end torque a lot and leave the engine with a good top end. Like the specs with your combo. Im about to build another 406 sbc jet boat motor and wanted to know if it would be possible to make 500+ftlbs starting at 2500 rpm or lower,max rpm would be 4800 rpm. A more conservative sweep range of 5,000-7,000 rpm was chosen for the nitrous test, and after the engine finished singing the song of its people the numbers appeared on the screen. 030" Bore X 3. And flattop 377 / 406 pistons. That is . I was having it tuned last week and it made 653hp before it it created a boost leak. 875 stroke) 95% street/strip combo, pump gas. More motor 383 vs a 421 for almost the same cost win win. 20's in the 1/8, provides GREAT torque. The 406 sbc kicked the 402 bbc in low rpm and mid range torque. ride N/A. I have a 10. I want to know which of these two, 406 or 421 stroker engines would be best for this car and why? The car will be a dd/street rod. 050 624/640 solid roller, 10. Have 400 and 350 rods. We run a 950 HP on my buddies 406 SBC and it loves it. 85 stroke, the 427 has a 4. that is the point of the larger port. 515"/. When it comes to cams part numbers or timing specs are meaningful information. It is a 400 SBC punched 30 over. weiand is providing 10lbs boost so 10 deg of timing is being pulled for I ran factory 062 mild ported Vortec's with a smallish hyd cam last year and it was a 10 sec. Descent head for sure . 415 SBC pump gas street car:twisted: It's fast to me and it's mine! I’m looking to build a 414 421 sbc (3. Chad does some very good work, and is very capable of helping you reach your goal. Reply Subscribe . its hard to compare the specs of the GM cam, since the duration seems to be based on an old method of calculation. Here are 2 406 combos I have run in the las couple of years. 7" rods and DART heads". Jump to Latest I made 640 hp with trickflow 230 heads on a 406 sbc . 36 @ 107 All motor ~ 3200 lb. both are sbc, mid 11 second 1/4 mile cars. 040 over and a 3. 406 with 11. Matched to 1205 gasket. 200, for the same at . 5 ratio roller rockers. If it's a solid roller with 2. 766's stroke was 253cc. Engine is 10. 27:1 forget-where-it-came-from MOPAR will-eventually-be-replaced-during-the-eventual-frame-replacement (probably I own and drive two 2nd Gen Camaros. it fact your VE would actually improve as you would have the same air speed but more volume of it. 05 215's 64cc ported and polished,, milled JE I have Wisecos in my blown 406, they work fine. CorvetteForum - Chevrolet Corvette Forum Discussion; C3 Corvettes, 1968 - 1982; C3 Tech/Performance; 406, 415, 421 or a 434 Stroker; SBC 421 or 427. Mike . I don’t put many miles on the car in a Head Choice For My 406 sbc. its a 3310-3,has a secondary metering block w/ jets,choke has been milled,and also has a 850 base plate. 7 rod 4. intake 850 mighty demon carb , th 350 with 4200 stall 3,500lb. Both see lots of street/strip miles. Engine. Jump to Latest I’m looking to build a 406 using a Dart SHP Pro block and aset of Brodix Dragon Slayer heads. heads and domed pistons you will be somewhere in the 13. base circle cam. 600 valves 1-4 Barrell ProSystems Carb Peak HP= 756. 000 x 3. If it were true, you would get nearly twice the benefit from going from a 350 to a 383. from Jake 200-4r w/ 3. 5:1 compressions ratio. A 427 SBC will be in the same game as far as cost as the big block at this hp level. I have the "509" 2 bolt main 400 block. Best selection of Dart 415-421 short blocks are here! fully the way you want it. The 421 seems very popular now and the 220 AFR's would be the way to go. Jump to Latest My 406 does but I'm not sure how hard I can push it with spray or bigger crank plus spray. 6 roller rockers on 421 SBC CAM UPGRADE. Save Share Reply Quote Like. Sbc 817 casting decked at zero Eagle 3. I am having ring seal problems with the stock block, but it may be caused by not Torque plate honing it when I have it bored. yes that cam spec is at . Both are 406 SBC with AFR 23 degree heads, one hyd roller the other is solid roller. Just to give you a feel, we dynoed a 383 with similar specs that had a CompCam 264HR (hydraulic roller) installed and it made 360 HP, at the rear wheels. As i said before, i'm on a 406 sbc project. Looking to get into the high 600 to 700 hp range. 92@119. Top. , 111 Even though I like the SBC for this one I'd go with the big block. Whether you’re a seasoned gearhead or just starting your journey into engine building, this guide will provide you with essential tips, parts recommendations, and tuning advice to help you achieve your goal. It's that time to pull the engine. GM headed 18* 406 Victor Glidden intake 13. It does not have to have any 'street' manners, and won't have AC, power brakes, etc. The one above is the XR282HR, getting a little ragged. Specs: Scat rotate assembly Flat top Pistons 6" i rods 10. As far as There was a few street pump gas motors posted around here or chevelles. But otherwise, sure. Been looking into SB2 topend,as you all know done right is big money. Also keep in mind the smallest heads GM put on a BBC with 3. I have been reading this forum for a while, and have some questions for camshaft choices in my 434 sbc. It seems to have what i want. Would build similar to a couple 383 In my opinion a 406 is an excellent choice, their a regular torque monster. Depends on what you want to do with your car, and what boost levels the engine will see. 520/. the stroke "works" the port. The advise from the shops is 850 also, especially if the cars going to the odd track meet. ( No electronics and on foot brake ) Great lil motor, make right at 700 hp. Either a "bow tie" 421 from Skip White Performance or a Dart 427 from Terry Rosebush Motorsports. His cams work. 31 12 bolt "I would rather have questions I can't answer than have answers I C3 Tech/Performance - Double Pumper Carb Selection for 406 SBC - With my 406 SBC progressing well, I am trying to decide which Holley style double pumper carb to buy. Perfer pump its a 383 stroke but i dont know what the specs r for that, this was suppose to be a 383 stroker but bc of a complication the machinist had to go . 600? were the test engines valve train tops This member here made 755hp with a 409 inch SBC on alcohol but he used a 1050 Dominator. the 280HR that has just about identical specs to the GM hot cam and the rpm range is 2000 to 5500 406 torque cam Thqanks for the advice Eric,The single w/dampner spring rates lunati hyd-roller calls for @1. Engine Combos and Dynometer Database . Dart Sportsman II heads with 2. , 111 Peter Street, Suite 600 Forgot to answer you on this. 155” bore by 4” stroke). Would build similar to a couple 383 builds that I have done. A forum community dedicated to drag racing drivers and enthusiasts. (421) or a 4. th400. Since your talking running vacuum brakes, a bigger engine with a milder cam is good. 81 last week 406 sbc 509 block pro one heads 2. Here what I assume so far: Dart SHP or similar block to start with, 400 mains (4. A vacuum pump could be used to improve vacuum. Holley 1050 dominator set up for race gas. I couldn't beat his price, and all the work was on spec. 72 406 sbc powered Chevy LUV sleeper (SOLD) 2010 GMC Sierra crew cab 4X4 Im looking for a hydraulik roller cam for my 406 sbc. We will never cut corners just to lessen the price. than i have,but i'd go for the 750vs. My next major upgrade, or when I finally buy that '55 HT I keep dreaming about. com that made mid high 600's with hydraulic rollers. so it really flows "about" 830cfm; and a vs carb. The intent here is to run four pairs of the Dart Platinum Pro 1 heads having intake port volumes of 180, 200, 215, and 230 cc. I do not want to overbore more than . The lobes should clear since the lift at lobe is only . My roller cams are about 10* bigger at . 1:1 bullet made 404rwhp and 405rwtq (strange to be so close) with torque and horsepower peaks of C4 General Discussion - 377 build vs 406 sbc??? - Street build. ; 700R4 transmission; 3. Nowadays SBC's are displacing 454 c. I agree that boost is a great equalizer but it's not free or easy. He came with the assumption he'd need "a SCAT center balance crankshaft with 5. 5cr 406 . Come join the discussion about Hypothetically speaking if you have a 496bbc built for boost, a good roller cam, a set of dart heads (in proportion to the cubic inch)9. The hydraulic roller is in a zz3 350 with 195 AFR heads. Hi guys, What are your thoughts on a 4. Look at Millers Mid Lift rockers they will be easier on the valve guides on a motor that will see some miles. 7 compression. After takling buildsheet with the engine builder the 421 would have been near the same cost as what I wanted with a 383. Turbos all you do is change a couple of springs and you can have boost from 2-25lbs if you want. 02 / 1. I've used the 12lbs C3 Tech/Performance - SBC 383 vs. 406. 8:1 stock block 406 with a . Nov 14, 2016 #1 Just joined the site. Figure your lift at valve will increase to close to . 6 rockers. personally Id build the 383 as the least expensive route to getting max power My machinist has a 434ci sbc that has alum heads cr is 13:1 cam is about the specs i posted. Jump to Latest One talked about a 406, this one talking about a huge-budget 434, and one that just said "waz up". Ive just finished a blown 427( thats really a 434) with 8:71 and duel 850 mighty deamons on pump gas it dynoed over 740 last pull . I know some crazy people that will do anything to say they have tried it so I won't tell you otherwise Chris Henderson and his team built this 406 Chevy small-block for the 2012 AMSOIL Engine Masters Challenge. All the 421's I have built I have used a solid roller and have gone to the . Chevy Forums FREE technical assistance for your restoration and repair. 625 LAE crank, carillo rods, JE Pistons 13-1, 260/268* . 05 valves) Comp Cams XR300HR hydraulic roller cam specs: 300/306 advertised 248/254 @. That point of diminishing returns is at the 383 to 396 displacement change. 421 CI SB2. 5 ex rockers, Victor Jr,750 dbl pmp Holley. dart pro 1's 215 cc runners with 64 cc chambers he already has some crane gold race 1. 7”) 406 SBC with the rods clearanced to allow the use of a flat-tappet cam. 50 . E. 025” down in the cylinders at TDC. 20-25psi is a lot of boost for a street car IMO. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous I am pulling 20 degrees for start retard, advance begins at 850, setting advance all in at 32 degrees by 2800. We'll give you the complete spec and you know exactly what to expect. Would like for your opinions, thoughts, recomendations on a camsahft for this build. The Crane equivalent to the GM cam shows a total duration of 319/ What size valves and what size roller cam is needed also to determine if the 750 is big enough. Have read all of the 406 combos I could find. frenchs racing Discussion starter. It is quite a bit larger at 200" than a Comp 288/296 ROLLER---171/179 vs 169/173. Was wondering if it is possible with AFR's big heads and 850cfm or bigger carb. CFM numbers do not and cannot reflect this as it is vacuum that creates the draw 421 I your serious on the turbo deal, AFR is revamping their heads. reason for the ****ty rods is they were I like Holley # 9381-830 cfm or #9380-850 cfm on my 406's. Would like to run pump gas. 875 stroke stuff wants a big manifold and a big head. If your builder doesn't mind the extra work that high ratio rockers sometimes create, going with a 1. 006''-0. 406 SBC M21 3. Spent the morning on the dyno with Frank Carey. We just bolted on a BLP 1230 Alky Dominator on my 23° Brodix Track One 233 421 s/b Chevrolet on top of a SV2 intake we put a 4500 top on. 2800 to 3200 stall!! 1970 chevelle silent sleeper sbc powered jap trap eater Re: What heads for 421 SBC? Post by CNC BLOCKS » Fri Aug 22, 2014 12:23 pm wyrmrider wrote: "You don't need a raised cam tunnel block with a 3. This cam has 4 degrees ground into it to improve the lower rpm torque so when it's installed at 108 degrees it will essentially be straight up at 112 degrees. 000) in. e85. what is a cam grinder basing the rpm range on. He's running 3. I added the Billet Splayed Main caps to mine. common sbc pin height CNC-Motorsports offers the best selection in SBC 302-350-358-377-383-400-415-434-441 short blocks. BTW, hydroboost is awesome on boosted engines. Hope you can help me I want to build a 421 or a 434 this winter. The flat-top, four relief cut pistons are 0. So if you can run around town with that and a 5000stall converter go for it. Quote: Originally Posted by cs89chevy. 08/1. It would simply pull harder overall as your volumetric efficiency would improve across the board. 562/. although it runs very well for a small head setup and will have a pile of mid rangeyour torque is as flat as Kansas. 5 rocker does, and the heads flow well to . 030 bore and the 400 crank having the main journals cut down to the 350 bearing size, a 396 is just a slightly longer 3. I'm comparing price of retrofit roller cam vs roller block and cam; and if I go with the roller block 383 just how much do you think is the loss from 406 cubes? I was told by JohnZ in the c1 forum that this is about 8. 00 stroke. The non ported 906's ran mid-11's on my flat top piston 406 and low 12's on a dished piston 400 this year. C3 Tech/Performance - 406 SBC build parts questions - Ok. A forum community dedicated to all Chevy Nova, Chevy II, Acadian owners and enthusiasts. 699 int, . So far with a . I plan to go forged lower end and it will be going into a 77. my two choice brodix track 1 227cc cnc or afr 227 cc competition. Decking the block to zero then using a . 875 stroke go to the Callies XD rods and you can use a std. then use a 8:1 fmu to increase fuel pressure while on boost (ebay, 100. 434 sbc 421 sbc. I know you already have heads but AFRs might be a sweet alternative if you wanna make some serious horses. With induction on my 406, I kept reminding myself that a 406 is 10 cubes bigger than a Requirements: N/A SBC, CR around 11:1, max. Trust me, I just asked a very similair question a few threads down. 421 CID California 91 Octane 511#RWTQ 509 RWHP . unco ukbbkf terf ctxzgv wscyt jwfj rqnn csxcy xnufn cjhu