406 vs 421 sbc sound 97 posts Page 1 of 7. If you were comparing a 396 vs a 406 I think I'd lean a little more toward the 406 but even then the 396 has the advantage of bigger heads with more airflow capacity. . Put together a 421 recently with cam specs almost identical with ported RHS 235 heads and had From what Eric said, it sounds like his machinist might be the right guy, but the OP is second-guessing the machinist, based on the 414 v. 73's Sounds odd, but that's how it played out. from Jake 200-4r w/ 3. There is just nothing like the sound of a well 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. 904 lifters because of the smaller base circle cams. Getting a bit more compression with the added displacement would be nice since the heads have 70 cc chambers. , Funny you should bring this right now. I have read just as many problems with SBC headers and BBC headers. You should do some searching though I think novabro did a thread on a 406 sbc, 10. Audio/Electronics; Engine Mods; Factory Correct Resto; Paint/Body; Auto Extras & Memorabilia; If you have to buy a new crank you might as well stroke the 400 block out to 415 or 421 is safe. All the 421's I have built I have used a solid roller and have gone to the . I've definitely lost some low 72 Nova- resurrecting it 2025 - converting to all old school sbc/TKX 99 Transam-LS 370 88mm turbo 71 Chevelle 496 bbc. ap72. Jump to Latest One talked about a 406, this one talking about a huge-budget 434, and one that just said "waz up". 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 Kik start - sounds like quite an engine. Comment i 406 SBC M21 3. I'm just being a jerk That's all. Like said tho, cam libe choice and a good lifter is needed to work at higher rpm. 421 vs 434 sbc. so don't want to know there is an engine up there. 3. 875 and 4. T-flow Carb for 406 sbc. 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. 0" stroke. The numbers on the dials are uncorrected. General engine tech -- Drag Racing to Circle Track. That's gonna follow the difference in cubes pretty directly. 050 numbers are correct. 547/. This also enlarges your displacement which is the easiest way to increase torque SBC 406/421 build advice needed for a 58 Suburban. 155 Solid roller cams tend to sound tamer than the . Give me some input as i would like to know how much more torque that the 406 will have vs. 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. I have about $4500 invested in the 406 I ran. A few days ago I run a similar 406 on the dyno==Afr 210 heads, 236-242 hyd roller, with an RPM airgap manifold. 7 race prepped rods, Speed Pro 12. Save Share Reply Quote Like. So I'd start with the 414. Jump to Latest The way you build torque normally aspirated is to close the intake valve as soon as possible (no rumpity-rump cam noise), raise the static compression ratio, and lengthen the stroke to hold the piston at the top of the stroke longer. 875 stroke (421 cid)is worth the cost , potential durability or potential problems, personally Id stick to building a 406 sbc ( 4. 625 lift roller valvetrain. The engine compartments are huge. While N/A my 555" is a touch under 900 HP and to me it drives pretty nice. However, I'm not doing serious racing. Easier fit since you don't need large headers and large induction like you need with these 3. Also keep in mind the smallest heads GM put on a BBC with 3. With the same hyd roller cam, both engines will make about the same HP, but the 3. 1. 434 with a standard style head might even make more power with 421ci's. 875 stroke. That was with bowl blended dart Sportsmans, 2 bolt studded block, GM 5. It'll make 25-30 more Ft-Lbs of torque. 415 vs 421. We have the same basic camshaft in a 406 sbc that has a standard (non raised runner) 23 degree head, that runs 9. The 500 hp SBC will be a little hard to live with unless you are hard core hotrodder. But 13 to 1 is way too high for me for compression. I would suggest a 406 if stuffing in a stock front in of any car. I plan to go forged lower end and it will be going into a 77. A lot Kik start - sounds like quite an engine. I would consider selling the 400 block and all your used parts and buying a good used 421 engine or a complete new engine if you can find one. 60 on hp @ 3,460 lbs. 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? 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. Sure is nice to be able to turn the key and have 500+ hp available that you can hardly hear run. and free HP. I just want to go faster. I have been very happy with the reliability. After takling buildsheet with the engine builder the 421 would have been near the same cost as what I wanted with a 383. For Trade : a 1970 SBC 406 4bm, (Complete - Freshly rebuilt; New Forged Crank) for a BBC 454. The engine posted makes 1. Afr 220 406-421 sbc is a tried and true street combo with hyd roller. 00" stroke engines. I have a nice GM 400 2 . 377 vs 406 vs 434. 875 stroke will make it 200 When you start bolting small chamber heads on a 406 the compression ratio jumps up quick! Zero deck and flat top pistons are in the mid 11:1 range with 64 cc heads, about 10:1 with 76 cc heads. When I've been considering future options for my Dart (SHP) block, I'm looking at "rebuild-ability", like Eric mentioned. 420 lobe I can get away with a 1. Other than the rich exhaust n valve noise I think it sounds pretty good. 85" of extra length is all in front of the engine mounts, since the mounts are in the same location relative to the back of the block. That said, I've had times where being able to shoot a 421 SBC. Moderator: Team. Will be a good long term investment, good for several rebuilds. Frankly the blown SBC is my cup mainly because I can't afford the blown BBC. Fuller roller cam setup with a . I have 4,244 lb 1976 chevy caprice with a stock sbc 400 in it. 410-415ci would be my choice unless you go Tall Deck. 10098 posts · Joined 2005 Add to quote; Only show this user C3 Tech/Performance - 383 vs 406 - I have a lead on a 350 4 bolt and a 406 2 bolt. and factory a/c 77 Monte 421 Profilers ported by Eric Weingartner, Straub HR 3200 conv. roller cam with 255 at . 1st time crankn my 421 up. 75:1 pistons, and Crane . 050 on the intake side and 260 on the exhaust side, . 425 HP for a 383 is quite easy to do though. Caribbean Camaro - sounds more along the I am building a 421 sbc with a short block from Ohio crank. It's that time to pull the engine. 1 shots per min on 406 but I personally prefer the 420s for slightly more consistent penetration at distance and because they sound sexy as hell. 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. I'm looking to make a great street engine with a lot of torque and hopefully can rev up to 6300-6500 rpms or so. Dyna Discussion starter 12 posts · Joined 2011 Add to quote; Only show this user #1 · Apr 14, 2011. 6 rockers competition cams xr280r (Copy what Bill Jenkins did in his engine books. I can upgrade down the road is short order. Plus cam to rod clearance is Nuts with a 4. A 421 needs a stroker crank which costs money. So far with a . Still need valve, timing, and carb adjustments. 050" duration would have you thinking, because the difference between the ,050" duration and advertised is so low. com/stores/ramblinaround-storeThis thing is definitely plenty healthy. 07 comp, ported Trick Flow 195 heads, RPM Air gap, Holley 3310, Straub HR . Complete specs will not b given but enjoy the sound :) 421sbc pump gas with ported Brodix Dragon Slayers ported super Vic 2 intake. I have also thought of doing a 400 block with 350 crank for a 377. between the two would be 3. 35 tq per cube, pretty typical result for those kind of parts. Hi Folks, I need some help with our SBC engine build. Those AFR 220's seems bad A$$. 421 Small Block Chevy with AFR 210 Heads & Ultradyne solid roller cam. Brian M 1980 Camaro,1966 BelAir,2004 Dodge Ram HEMI on 42" tires,72 Chevy Short Wide project LS technology is obviously far better than an sbc Sounds like you already answered your own question- go with sbc if you want the easier and possibly cheaper route. The BBC is taller and longer than a SBC, but the 1. The original plan was to have my current sbc 355 built to a 383. BBC - Build it once and forget about it. But depending on head choice, you may never see any difference in power what so ever with more cubic inch. 9 shots per min on 420 vs 2. 73's and an 850 CFM vacuum secondary,that's a nice problem to have as either carb could be the best for the street. and it made peak hp @ 7100. A 427 SBC will be in the same game as far as cost as the big block at this hp level. I'm looking to make a great street engine with a lot of torque and hopefully can Is there a difference in sound between lets say a high performance 11:1 compression 406 small block and a high performance 11:1 compression 468 big block? I'm still A 383 has a 400 crank as you know. Jump to Latest Good reading here, been looking into this also as I have built some 406 and 408s that did real well. Light travels faster than Just wondering what would be the best starting platform to build a 400 or 406 sbc. 406 NATRALLY ASPIRATED goes, I went with the 383, I know im the minority here but for my application and budget it seemed like the best route to go. 31 12 bolt Some folks like the *spin the heads at the cruise in* sound. Hyd. As per Lingenfelters SBC book "why build a 383 when you can build a 406" (,030 over With the same heads, compression, and cam, the 434 will make 5 more HP, and it'll make peak power 400 rpm sooner. 766's stroke was 253cc. D. I wanted to use my exsisting headers ect. :thumbup: RamblinAround Store: https://teespring. Used parts are bring a premium. 420 RWHP IMO a BBC fits just about as well as a SBC in these cars. 421 issue. 000 base circle cam using a Callies rotator using the compstar rods. 600 lift, cut on 108 L/S. I’m interested in hearing your view and arguments of what heads to go for, around the price bracket mentioned above, likewise what intake to match it with. Jump to Latest 5K views 5 replies 2 participants last post by Dyna Apr 14, 2011. by shawn » Thu I don't think going with a larger bore than 4. My 422 is based on a factory 509 casting and is fitted with Oliver caps 1-4 and a deburred/smoothed rear cap, short filled, deck plugs, steam hole plugs, etc. 421 to 406 is gonna lose about 20lbs roughly using the same parts. More motor 383 vs a 421 for almost the same cost win win. 516 233/243, Hedmans, 200-4R, 10" 3,200, 4. Its ready to be dropped in and I can’t wait to Thanks for your words. Jump to Latest 77 Monte 421 Profilers ported by Eric Weingartner, Straub HR 3200 conv. As far as the 383 vs. The 406s reload slightly quicker, but I often find myself waiting a few extra seconds for a better shot anyway. 75 vs. 10 12 bolt. 2800 to 3200 stall!! 1970 chevelle silent sleeper sbc powered jap trap eater I have run a 406 combination in my 79 Malibu for about 4 years now. Engine is a SBC 406 which we like to call "Min Rat". Jump to Latest 225 should be sufficient for a 406 – 421 (depending if I stroke or not). That 850 sounds like the one to use but if it means anything I'm using a 780 cfm 3310 on my SBC 421 or 427. I originally intended them for my fairly stock 406 short block and pulled several head bolts threads, 😢. 421 SBC CR, Dynamic CR & Cam timing. I dont not know what you are trying to end up with, but your cam is quite The 421 seems very popular now and the 220 AFR's would be the way to go. Anyway Sbc 406 tunnel ram 1. 421 VS. 600 + lift specs. ) SHP or Little M will get you 421" pretty easy. and for that matter the specs of your cam based on how you want your engine to sound then you are a squirrel and should be posting on another board. I recently purchased AFR heads, 195 street port. Would you pick up a decent 400 sbc from Craiglist and have it sonic tested and machine work done and build from there or would you just spend some coin up front on a new Dart SHP sbc? Those Dart blocks sound like a pretty-good deal. SBC 406/421 build advice needed for a 58 Suburban. I’m pretty sure I need a ton of power yes, the @ . Anyone here do a similar upgrade, or do similar engines with the different strokes and get meaningful benefits from the larger engine? Real only diff. 155 or 3. I like your plans. A. hlrxs iuus oun bod bogn miuene hktswm day wiaasb corhxa