What is a 421 sbc. 00" H-Beam Rods, 4.
What is a 421 sbc Nowadays SBC's are displacing 454 c. 6 and 1. 18 int and 1. Converter is a 8" PTC with a 4600 stall. Clarke has T&D shaft rockers in it as well, and the engine has a bit of nitrous, which was untested when we spoke with Brian. The 421, using the 400 based block (like Jim typically builds), is certainly worthwhile. DaveMcLain wrote:I agree with Joe in that 4 inch stroke is not really a problem with a 6 inch rod in a Chevy engine but your choice of rod can make a BIG difference as to how much clearance work needs to be done especially when it comes to clearing the cam. 12 posts • Page 1 of 1. The RHS heads are nice castings, but they NEED detail work - Especially where cylinder pressures are going to be up there. Hello Gents Right now I'm studing and searching for cam lobes for my 421" strip some street project . 125” bore. You may have to clearance the rods but that will be way better than a small base circle cam. 060˝ to end up at 4. Took it to the strip and ran a best of 118mph for the quarter Wayyyy toooo slowwwww! My first guess is fuel. To handle the extra load, this 421 SBC started off with a Dart block filled with forged stroker spinny-bits and 10. 4 Finally got my sbc 421 together and put it on the dyno Here are the specs: 4. Nice that a smaller head can do almost the same. 75" stroke)for what your trying to accomplish Id talk to CROWER, LUNATI and HERBERT cams Afr 220 406-421 sbc is a tried and true street combo with hyd roller. 6 in the quarter with no tuning and that was the only time it was tested before I built another engine. IMCADW. Very streetable. This particular 421 cubic The 421 seems very popular now and the 220 AFR's would be the way to go. L. with Titanium 2. So far with a . 875" "stroker" crank to make a 421 at the . but im looking for the best way. 038 rod to cam clearance. More lift if possible. 045 cam to rod clearance. U will be in the ballpark of this. 940 stroke with 2. Spent the morning on the dyno with Frank Carey. They increased the bore by . 99 /kit. Find local businesses, view maps and get driving directions in Google Maps. 868 diameter cam can still be run full base 421 dyno results. 875 ). 040 over and a 3. Thread Tools Search this Thread Jan 5, I would agree 100% with this statement and having built quite a few 383's and a couple of 421 SBC's the 383 will be a cheaper and I believe more reliable setup. 75 crank to a 3. SBC 421 or 427. Horsepower and torque depend on several situations that exist within an internal combustion engine, but one crucial component is displacement. I'm looking to make around 650 hp, and get solidly in the 9's. roller cam with 255 at . I have done similar builds and experienced the same. i myself run a 421"sbc 18* standard deck and 6" rod and no more then 300hp, and im on the very edge of melt down. is a second on the 1320, so do the math. Jump to Latest I thought hp was low too,i bought a -10 Brodix Neibel Racing Engines,dirt track 421 a few years ago that my engine builder said should make 690-710 range but parted it out and kept the heads. So with a Dart SHP/somekind of reasonably priced head/valvetrain with non shaft style rockers, a 4150 carb, a decent oil pan/pump, cam that you don't have to change springs every weekend, a decent $2,000 rotating assembly, there is no I have a 400 GM sbc. I've a friend that has a 421 SBC 1/4 mile Mill (Owns a Garage and Speed Shop) - Not a Ride by any means - Costing much more then my mill with a Dart Block, Com Star Crank, Oliver Rods, Weisco Pistons, AFR Heads, Jessel Shaft Rockers and the list goes on and on but he can't drive the Car on the Street - Not my Bag. of Hey guys,this has probably been talked about on here many times but I am a newbie to speedtalk. 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. No I 'd say. The 421 SBC I have AFR 220's on peaks (horsepower-wise) around 6300/6400 RPMthat's pretty high for a big street motor. 000 base circle cam using a Callies rotator using the compstar rods. So I think I found my happy medium. looking to make peak horsepower The EngineLabs Homegrown Horsepower series focuses on engines that are self-built by the EngineLabs faithful readers, and encompass many different styles and types from mild to wild. Most of them costing 12,000 and up. My plan is to stroke it to 421 ci. 875 Stroke. 3 @ 5600, 424. I want to build a 421 CID with a 4. The newer rods may need nothing. Jump to Latest i'm look this winter to build a stroker 350 to 421, Dart little M Block whit from scat 1-421FHPS (whit lightweight crank) Chevy 350/400 4340 Forged Crank 3. 5400 conv. 875 stroke,4. 235 cc 421 SBC - 3800lb - TH2004R - 3. Getting compression with my 421" 23* combo meant big inefficient domes wafer thin head gaskets and . It will sound nasty, and In it's mildest form, a 421 will boil the tires for blocks and live a long time. Post by RobZ28 » Mon May 27, 2019 4:53 pm. danta Discussion starter. 85" length rods versus 6. Ever since getting his 1969 Nova in 1985, Brian Clarke has had a few different powerplants in it. also have a gm 2 pc spider intake that is ported to match the heads. 875" crank with 2. 125" stroke in a 4. 8 @ 5800 RPM ( 464. Jump to Latest I built a 422 sbc using a stock block. Even though it’s a GM LS world, the Gen 1 small block Chevy remains a popular choice for many builders. We have the same basic camshaft in a 406 sbc that has a standard (non raised runner) 23 degree head, that runs 9. my application is a 421 sbc, brodix 233 sts t1 heads, comp custom with . I am looking at a Wheeler kit with their 4130 forged crank, wheeler forged 4140 rods, with forged flat top pistons. 875 stroke crank I did use the Callies Compstar 6. 5:1 CR, 280's/. This is going in my 2750 lb mustang. Save Share Reply Quote Like. RTCTTFMF!!!! Stock suspension 67 Camaro 565 Conventional head BBC with fogger and a plate on 275's Re: 421 sbc cam and combo help Post by af2 » Thu Jan 10, 2013 1:41 am jklogan1987 wrote: got a cam on the way 112 lsa 640 656 lift and geting heads and intake port matched to 230 cc 4500 ptc nos stall and a one stage 250 shot will let you know what it does in at the track this season Re: 421 sbc build. 421 SBC Pump Gas Build. Or less stroke, 3. Just something to think about in the future. Jump to Latest 17K views 31 replies 11 participants last post by trmnatr Nov 20, 2011. L. 00" to move the piston pin away from the oil ring the 6. If you are not going to be turning any high RPM you should not have any problem with the stock crank and rods, just add some good rod bolts and get some pistons to give you the compression ratio you want. 60's at 137 on a 250 shot. What's the potential of these heads on a SBC 383? Obviously roller cam etc etc. and it made peak hp @ 7100. I built a 421 about 10 years ago, dart little M, scat rotating assembly, je pistons, dart 215 pro 1 heads, 620 lift hydraulic roller, victor jr, Why not the tried and true 406 in SBC or better yet a 408 in a LS. Torque is a function of the ID area of the tubing & PK TQ will occur very near an exhaust gas mass MEAN velocity of 245-260 feet/sec. Post by monkdafyed » Wed Feb 16, 2005 3:38 am Hi Guys, I am in the process of building a 421 SBC which needs to make minimum 700 horsepower, I am not sure what type of head to use. The rods in question are the Scat Q lites (with out the hole) and have 3/8" capscrew bolts so I believe will have a bit more clearance there. The motor is 13-1 compression. Gets about 3-4 gallons to the mile. and 1. Solid roller cam. Brodix track 1 heads. Which carb would be best. 875 4340 eagle crank 6in eagle rod 40 over 400 block 670 sollid roller 1. Save Share On my 421 SBC (full roller valvetrain) I used straight 30W for the break-in (builder's recommendation), moved to 10W30 for 500 miles, Re: 421 sbc cam and combo help Post by af2 » Thu Jan 10, 2013 1:41 am jklogan1987 wrote: got a cam on the way 112 lsa 640 656 lift and geting heads and intake port matched to 230 cc 4500 ptc nos stall and a one stage 250 shot will let you know what it does in at the track this season 434/421 pump gas SBC head suggestions? Not a N/A Pump gas motor, but they are good for well over 700 (N/A) on a race gas nitrous 421. 31 12 bolt Put together a 421 recently with cam specs almost identical with ported RHS 235 heads and had similar results. I am building a 421 that will have an 8-71 blower on top. The engine consists of the following: forged 4340 crank, forged 6" H beam rods w/L19bolts & tool steel wrist pins, forged blower pistons 7. The Edelbrock 421 Stroker is the engine they used to develop their aluminum 409 heads. 1"^2 larger in Hi just curious what you guys would recommend for my 421 sbc it already has AFR 227 heads #1068 on it which are straight out of the box. a lot of kits with the 6" rod. , heads have 2. 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. what would be the best size to I have been around a few 700hp/500hp sbc. More motor 383 vs a 421 for almost the same cost win win. 8 @ 6100 ) Speed-Port 6000 intake torque 466. 56s, 38s, SM465 (manual with granny low 1st gear). 050" opening and closing points for the centerlines I suggest, and that's what they install the cam on. the bbc cam I took . 9 ft. Aluminum Profiler heads. Thinking 600 lift area 114 lsa and 240 @. i would say 5. 657 lift on the exh. 7 exh. 4:1-compression Bullet pistons. 5 to 1 compression & cams that weren't any big deal by today's standards. . 8 intake and 1. Save Share 421 SBC 1050 Ruperts Alcohol Carb BG Fuel Log with regulator built-into the front Belt driven pump w/ 3 gal cell MSD-7Al2 Locked MSD Billet distributor (Crab style) What is a safe starting point for static timing on a 400+ SBC running 14:1 alky. i. 660-. Guys I am building a new 400 block from scratch. The fuel This thread is prime for some Gary Chico interjection on the 421 he "was involved with". $2,012. 875" stroke 421 would require less clearancing than a 434 or similar 4" stroke engine, plus a wider range of 23* heads would suit, rather than a 4" stroke motor which would require a larger head if I wanted to rev it past 7500rpm. 155 or 3. This is a race car only. Its on-track success is what helps the street iteration perform so well on pump gas. 875 stroke. Complete build as well as others are found on 1320techtalk. 421 SBC. It does not have to have any 'street' manners, and won't have AC, power brakes, etc. These engines are commonly used in drag racing, circle track racing, and street rods due to 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. 670 range. I have a 421 SBC in a 3300 lbs car with a turbo 400 stall 5800 My heads are a mid 90's All-Pro Raised runner Spread port (not like the current All-Pro RR 245). I am starting to lean towards 18 degree heads. New bullet this year 421 sbc 18 degree Brodix 14-1 compression 114 race fuel was told 36 degrees timing from last owner seams high to me. 5 at 125 on motor. The 460 figure is on an AFR 235 headed 421 SBC while the 480 number is on a 220 headed 400 SBC. The 350ci SBC had a maximum power output of 140hp at 4200rpm and torque rating of 240 lb-ft at 2800rpm. 65 ext rockers) This 434-inch stroker small-block Chevy was built to race and made 681 hp on the Westech dyno! But performance is more than just peak numbers. Hope the following chart displays in an understandable manner: SBC 350 and I have run just regular 10W30 without any issues at all . in/cylinder. 80. BTW, hydroboost is awesome on boosted engines. 406 SBC M21 3. I had this cam in a mild 383 with vortec heads in my first sbc. Looking to make a real 650 hp on a 421 sbc pump gas solid roller light crank and rods dart little m block whats the best head out there to hit that goal and how much cam and carg does i 700 horsepower 421 sbc build sheet. I don't think going with a larger bore than 4. 699 int, . Getting into the upper 600hp range from 421 ci of small-block means turning some revs. 6 exh. ecc_33 Discussion starter. looking to do a Call Hedman Hustler header race division you might get lucky, Doug Herbert has the best pricing when you find a part number to order, now the size that might work for you the best depends on your flow number from your heads & cam choice, good luck 421 sbc can be a beast when you have the right combo. 5 @ 5800, 423. Ithink it was 450 inch and 1088Hp. 038 2ND, my 440 SBC has lived with a 32 in the fogger, 5. Customer already has a set of AFR 210's with the 76 cc combustion chamber and extra hand porting done. The push rod's will not be that big of a deal in this type deal, but the best your willing to spend the money on. Those aren't even peak torque numbers (which are in the mid 500's on both of these engines). 150 and 1. Moderator: Team. Jump to Latest My machinist has a 434ci sbc that has alum heads cr is 13:1 cam is about the specs i posted. $2,158. They need deck plugs added and really need a partial fill for any significant power. Is there any disadvantage to a 4. Thanks for your words. 7 int, 1. The ONLY time on this engine is dyno and run-in time. 77cruiser Guru Posts: 1504 Joined: Sat Dec 30, 2006 3:32 am nevermind,. 050 on the intake side and 260 on the exhaust side, . See less See more 68' Z28- 421,Backhalved,Alky 64' Nova SS "118" VIN Project Re: Pump gas 421 SBC HP Post by swampbuggy » Tue Jun 08, 2021 2:04 am What i wanna know is the details about the caliper Mr MT is holding in his picture on the right side of his post's. Yes,I already got the rotating assembly . ratios. But motor was cheap and just used what was around. 42 Street car build. My 422 is based on a factory 509 casting and is fitted with Oliver caps 1-4 and a Skip White Performance is one of the biggest players in the industry pumping out an annual average of 900-1,000 engines each year. I’m looking for any advice on the combination of parts I should use. 875" Stroke, 6. The price is 421 SBC CR, Dynamic CR & Cam timing. Like said tho, cam libe choice and a good lifter is needed to work at higher rpm. so you could have a better sellection with cams. my question is how much block clearancing will have to be done and where,also using eagle or scat stroker clearanced rods and . 420 lobe I can get away with a 1. SBC 421 combo advice. I would want a 2" rod jurn. Hyd. I see that the 6" rod combo is the cheaper way to go . I’ve seen some last quite a on a comparable big inch SBC 400-440" how much better are 18 or 15 degree heads than their 23 degree brethren. 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. 60 on hp @ 3,460 lbs. 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. with all the talk about pushrods on here i would like to know what truly is required for a sbc for pushrod size and thickness. it will be in a i want to do the large sbc thing also with the 3. The SCAT 7/16 bolt I beam rod is about the best I've seen when it comes to clearance. 904 lifters because of the smaller base circle cams. The Sportsman 434 is popular because the engine isn’t a dyno queen and is quite the workhorse on the dragstrip. ) SHP or Little M will get you 421" pretty easy. need more hp Post by rustbucket79 » Tue Aug 28, 2012 1:53 am You probably shouldn't get too crazy with the light tension oil rings since nitrous is part of the equation, but Keith Jones from Total Seal helped me out a bunch with the ring selection in my 406, give him a call. Sponsored by: E85 421 sbc almost done! Reply Subscribe . 73's Machine work by Torvinen's machine 11. Add to Cart. The original plan was to have my current sbc 355 built to a 383. I had some 23 degree heads but have a hard time getting flow high enough to make this power. 7000rpm, has to be Hydr. Randy. 875 stroke (421 cid)is worth the cost , potential durability or potential problems, personally Id stick to building a 406 sbc ( 4. 155 bore and a 3. Bought a 421 sbc circle track motor. 875 stroke, 421sbc nitrous motor 12-1 compression, 5. sundance Discussion starter. The 421 using the 4. Those are big block numbers guys. The engine will be set up for a "tough" street/strip car (more street). the motor is a 421 SBC, 14. Finish line rpm would be geared appropriately to 7200+ RPM. 1 2. 030" overbore in a 400. posted on for 396 sbc, not 406. 00 stroke in a SBC? I've heard that the 4'' stroke is less reliablewhy would it? We’re still enamored with conventional small-blocks, and this month we put together the ultimate thumper for any street machine. 93 @ 112. Gear is a 4. and free HP. Does anyone know if this crank will slide in and be fine with Hi guys, I'm thinking of putting a spare engine together for the car but want to hit the 530 to 550HP range. for instance, I know of a 340 cfm peak head that made 670hp, but when you calculate area under the curve there are heads that flow 325 peak but in terms of area under the curve to . We run the Brodix 18X heads a custom grind Comp roller cam, Lunati crank and rods . 300 raised cam Dart block to avoid this problem but you don't have an oil filter pad on the race block so you need to do something in a remote filter. 6 dome Jones cam (lift. 050 numbers are correct. Compstar rotating assembly and heads from Chad Speier. I'm having them inspected to see if they can be fixed. ,Yes Joe I know it's a cam for girls. 0 rods, Mahle pistons, Same cam 238/242 on 108 Lobe sep . Hello Speed Talkers I'm taking a look on headers for my 421 project, and have one in mind: Dynatech ,1 3/4" stepped to 1 7/8" long tube primaries and Cam recommendation help for 421 SBC. and 5:14 gear with 14x32 slicks. 17003 posts · Joined 2010 Add to quote; Only show this user #1 · Oct 2, 2013. I had my engine builder do this on purposeI didn't need a high winder. Im building a 421 sbc I have a dart block now I want to use. It is brand new, NOT freshened up but BRAND NEW. 000 which gives me appox. 420 lobe and I have had to run a reduced base circle cam to 1. The small-block Chevy is an American icon of performance, and one of the most popular 421 SBC : what headers to get? Post by BrazilianZ28Camaro » Mon Dec 05, 2011 10:52 pm. Top. Hello all, I have a question about a future setup. Building a high-performance 421 cubic inch small-block Chevrolet (SBC) engine that produces 700 horsepower is no small feat. Take this article for what it’s worth but I know 2 engine builders that have seen the same results on SBC 383’s with AFR 195 heads, hyd rollers in the 424. Here what I assume so far: Dart SHP or similar block to start with, 400 mains (4. It's a weekend TOY Hmmm, good question. Ray. in. 726 lift on the int. Motor should make 550 to 600 on its own. However, I'm unsure of the clearance between the oil pan and the cross-member of the frame, being that the oil pan will be different based on the changed demensions of the bottom end of the engine. raynman1969 New Member Posts: 35 Joined: Sun Jan 07, 2018 3:18 pm Location: Re: SBC 421 combo advice. Sadly, it will still likely crack over time. They are already a 15 degree motor that can produce big tourqe. Is there a better head for this application? Top. 5 rockers 2. as low as. Re: Pump gas 421 SBC HP Post by swampbuggy » Tue Jun 08, 2021 2:04 am What i wanna know is the details about the caliper Mr MT is holding in his picture on the right side of his post's. Which 1050 would be best to use on a 421 SBC. Another great day on the dyno, 421 the only difference from the last 421 is I used the AFR heads 1094-716 and I used a 1. 875. Had like a 2500 converter with a 350 trans, 3. so it boils down to your wallet. 050 for cam somthing like this 8. You would need to read up on the transmission ratios, rear gearing, and tire size to get what you want. from Jake 200-4r w/ 3. 5K views 21 replies 12 participants last post by swampy 6x6 May 13, 2023 Workin on a 421 sbc now, so just wonderin. S. Location: Main Index » Forum Index » Automotive General » Performance and other Engine/Transmission Topics » 421 sbc FusionBB™ Version 2. car runs 10. 421 sbc. Where was the Chevy 421 SBC race engine built? Stroked 421 small block Chevy street/race engine with all top of the line parts. On my asymmetrical designs, you can't even find max lift accurately, because the opening side is so much faster then the closing side, if you went down . Plan is pump gas compatible street strip deal. The 421 has a 3. 406. ,jesel shaftrockers with 1. With the Eagle Stroker Kit witrh the Stroker rods you can run a standard base circle cam also. 155 bore=(421ci)in a lil m block standard cam position stock pan rail. The nitrous can easily make up for any lost performance when you are at the track. The 421 cid small block Chevy also features a custom COMP Cams camshaft with a different profile to help the ramp speeds both in opening and closing. ( No electronics and on foot brake ) Great lil motor, make right at 700 hp. I would start with a 421 or a 427 the 434 is going to bore the block to the limit from the start. I like your plans. I think the converter needs to be a 5200ish stall. That is . Remember my heads are only 248cc which are on the medium to small end of 18 degree offerings. I want to build a 421 or a 434 this winter. Well, no big secret SBC's are lighter. Based on AFRs recommendation, the AFR 210 Comp Eliminators. Jump to Latest 22K views 60 replies 30 participants last post by Dentonmotorsports Dec 18, 2013. I have a 14 to 1 compression 421 cu. The initial build was costly but the freshen ups we did were only a few thousand. I want to shift this around 6800-7000 rpms. 8 1. We’re going to show you how to build a 422 cubic inch stroker small block that makes 700-plus horsepower that even an LS guy will respect. I give the customer the . I've been researching a bit and have been considering the AFR of course, along with Brodix,Dart Pro 1, Pro-filers,and RHS. Jump to Latest 4. Post by redrog » Sat Jun 16, 2007 6:57 pm. Seriously though, a factory block tall filled to the with good steel main caps will hold 650 hp. Take care of the jagged spark plug hole exit, get rid of the sharp edge inbetween the two valves, and polish the chambers, also sometimes they dont blend the top cut into the chamber wall very well and there is a sharp edge left behind. 060" thick wall & 18-gauge tubing is . That means we didn’t go overboa Yeah, but 434 starts with a raised-cam, wide rail motown block, then has a buttload of machine work and custom parts; crank, rods, pistons, wider oil pan, specialty timing chain and valvetrain, and massive heads to feed it. Will be a good long term investment, good for several rebuilds. What is a 421 SBC Crate Engine? A 421 SBC crate engine is a high-performance engine that is specifically designed for racing or high-performance street applications. Connecting Rod Type: H-Beam. D. But it may be time to replace them. I've started to save my pennies to purchase the heads for my antique sbc 421" build. looking to make peak horsepower around 7000 - 7200 rpm. Jump to Latest Grandma fresh GP,3700 pds,Pump Gas SBC, 8. 75" stroke, you could also use a 3. 030" bore (350 based block) tends to be more trouble than it is worth. 050" below max lift on both sides, and split the difference, you would be a few degrees The Chevrolet small-block engine is a series of gasoline-powered V8 automobile engines, produced by the Chevrolet division of General Motors in two overlapping generations between 1954 and 2003, using the same basic engine block. 60 stainless valves, t&d 1. Either a "bow tie" 421 from Skip White Performance or a Dart 427 from Terry Rosebush Motorsports. . 85 stroke, the 427 has a 4. It only shows it's big bore strengths with a large valve (2. Mark H. Whether you’re a seasoned gearhead or just starting your journey into engine building, this guide will provide you with essential tips, parts A 421 should be very tame with a 230 to 240 duration @ . 210cc Hydraulic roller A 427 SBC is about 22% bigger than a 350 in terms of total displacement and 50% bigger than a 283. with RHS SBC Heads + everything that was in a 406cid is now in a 434CID likewise another similar series of Tests on the new World Products #024020 alum SBC in coming Months. I was looking at running 5. 00 stroke. 00 rods. Carl used AFR 220's but also said later that the heads were too What is a 421 SBC Crate Engine? A 421 SBC crate engine is a high-performance engine that is specifically designed for racing or high-performance street applications. Referred to as a "small-block" for its size relative to the physically much larger Chevrolet big-block engines, the small-block family What's the BEST SBC to build for bracket racing in 2019? Let's discuss what's going to be in the car at the drag races this year, plus some other updates fro Recently built a 421 SBC which should be 600hp at the crank. Jump to Latest The 421 will live if its a good block I have 20 years off and on on one it just wont give up been in a dirt mod and 2 drag cars "IF IT DOES NOT HAVE A TRAILER HITCH ITS A RACE CAR!!!" TRZ Hello again Gentlemen I already read lots of good info about harmonic balancers here in this forum, but, Id like to ask which balancer you friends are using specifically in 421 or 434 SBC with great results, reliability or hp wise . My primary beef with hydrualic rollers is that the SBC has a fiarly small base circle camshaft, Here is a dyno sheet for a 421 pump gas with as-cast heads that made 600 hp. 08 valves turbo 400 trans going to turbo 350 and thinking of new cam this cam works @ 4500 - 7500 rpm and i foot brake so its a turd off 77 Monte 421 Profilers ported by Eric Weingartner, Straub HR 3200 conv. You can make it into a stump puller, drive all day or head to the track if you want. the head that flows 340 is less than . Car weighs 2710 with driver. 375˝ with the stock 3. 35 best 1. The car lays over on the launch and I think its because of the converter but just want to make sure the engine combo is right. 5 to 1 comp. 1 427 had bbc standard base circle cam and one with sbc . jump to latest whats the best stroke rod length and bore for a 421 sbc chevywith a turbo i know there is different ways to get this ci. I don’t put many miles on the car in a 421 sbc header size. ironman New Member Posts: 31 Joined: Tue Jun 24, 2008 4:32 pm Location: Cam recommendation help for 421 SBC. 500˝ stroke crank. It went 12. save share My low 10 second bracket engine will eventually need a refresh and I was kicking around the idea of changing from my 3. 134 posts · Joined 2011 Add to quote; Only show this user #1 · Nov 14, 2011. Jump to Latest On the 421's I have been building I have been using the Callies Compstar rods and a . Post by ironman » Tue Jun 24, 2008 4:44 pm. Going from there I’m undecided on which direction to head regarding stroke. 00" H-Beam Rods, 4. 6 rocker on the intake, Same as the previous build, SHP Block all machined, 3. 710 lift solid roller, etc. The 421 refers to the engine’s displacement in cubic inches, while SBC stands for small block Chevy. 030" oversize with the factory stock 3. i really need to know about the rod clearing the cam because i want to order a Tech / General Engine - SBC 421 dyno results - Finally got my sbc 421 together and put it on the dyno Here are the specs: 4. 14 posts • Page 1 of 1. Just wondering if anybody is running a comb like this and has a timing recommendation ? Save Share A 350 SBC at 6500 will be a cake walk for a drag car. 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. He is going to spray it every now and then with a 190 shot but mostly run on motor. I will get a good crank rods and pistons for boost with good rings. 406 is just a 400 bore . 8 @ 5600, 465. give me the pros and cons of each. I'm in the process of building / buying a SBC 400 based short block. Was actually listed on the most powerful SB thread. I was thinking of doing a 400ci sbc that would wind up at 406 or Looking for suggestions or recommendations as to what 23* head/intake runner size to use for my 421 build. 421 vs. Engine-421 SBC. 10" or bigger) that are shrouded in a 4" bore block, and real high rpm(8000) at the end of the straight. With a standard base circle cam and comp star h-beam rods that have 1. The small block Chevy is still a great option for your muscle car, hot rod, 421 Flat Top, 350 Mains, 6 Rod. I believe it was 421 and made 780+. O. Considering 16-gauge tubing = . I just finished a 421 with a standard base circle with Oliver rods just barely had to cut the corner on the rod. 700 horsepower, 585hp at the crank small block Chevy engine build and stroke length of 4 inches (102mm). Conventional lore has it, 1000 lbs. 12 int. You need a small base circle cam or the rods will hit it or go with a +. and . sbc stroke,rod length,bore. -lbs. 155 bore x 3. Also a bunch of 800+hp/675hp sbc. Cruiser and mud bogging. 499 posts · Joined 2015 Add to quote I'm helping put a cam/head combo together for a buddy for his 1969 Camaro. At the low rpm you are turning and with the head restriction you will not see the gains that this combo could produce. 6 int. One of those engines, and one of the shop's more popular models, is this 434 small I'm looking for a good cam to go in my 421 sbc. in totally aftermarket form, BBC's can be had from the crate at 572 c. It will not be too large nor is 421 a small motor. I was going to get a new 434" SBC short motor put together but took the advice that a 3. yes, the @ . 800 posts · Joined 2008 Add to quote; Only show this user #1 · Feb 27, 2010. No vacuum or check valves to worry about . 000 rods as it is much easier and preferably a 2. 7 Jessel sharft mounts no springs 434 sbc 421 sbc. sbc tune up/ timing. 61-4SPEED Discussion starter. I plan on using a Dart shp block. As per Lingenfelters SBC book "why build a 383 when you can build a 406" (,030 over I want a engine bigger than a 400sbc, but not as heavy machined as the 421 CI. 900 base circle cam will it clear. I ran S/S 350's at 8200 with light pistons, with well preped 442 cranks and rods. 421 sbc build up. The 434 SBC features an Ohio crankshaft, a Howard’s 4/7 swap Big Bottle camshaft, a pair of AFR 225cc conventional cylinder heads, 421 cid Small Block Chevy Engine. 460 bolts; they clear pan rails and cam. 060" piston to valve clearance on the intake. 6 @ 4200 RPM horsepower 465. 24 60 foot RTCTTFMF. trmnatr. Ive been out of the loop for quite a while and Ive always considered this site and a couple others to be great for getting ideas or even a clue when you need one. Jump to Latest 6K views 17 replies 16 participants last post by Camaro_Dave Mar 1, 2010. 875 stroke) 95% street/strip combo, pump gas. 875 stroke; and a couple 427 sbc with 3. Piston Material: Forged Aluminum. I wanted to use my exsisting headers ect. For the 421" SBC & 52. BUDGET biuld, Extreme Racing Engine of NY and BK. 155 x 3. Not quite at 2Hp per. 08 valves turbo 400 trans going to turbo 350 and thinking of new cam this cam works @ 4500 - 7500 rpm and i foot brake so its a turd off a 421 thats running right ,, should be able to suck an 800 through the motor and blow it out the exhaust ,,, i'd say an 800 is on the small side for a 421 X 2000% I'm running a 930 on a 385! I believe you need a vacuum gauge to find out what power valves you need. I have searched and searched sbc, sbc 427, sbc 434, You will easily reach your 650 goal with a 421. 0 @ 6000, 421. With the stud rockers route the cost of the valvetrain with the AFR 227s is pretty much the same when comparing with a standard valve spacing head. Re: 421 SBC : what headers to get? Post by Ron Golden » Mon Dec 12, 2011 4:22 am I dynoed a 406 SBC bracket engine with typical 1 3/4 x 30-32 x 3 with a collector about 6 inches long. 048" wall. 5 exh shaft rockers, am using isky 9995 gold strip valve springs with 414-421 sbc build questions. 30. presently im running 9. I would be happy to get 580 to 600 hp out of it with room to move in the future. Post by raynman1969 » Wed Jan 24, 2018 4:09 pm. RHS recommended a 180! I thought that seemed a bit small for a 421". 5:1cr w/n2o rings. E85 421 sbc almost done! C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette. 875” stroke The RHS heads are nice castings, but they NEED detail work - Especially where cylinder pressures are going to be up there. 1 ©2003-2006 InteractivePHP, Inc. i have a 421 sbc with a big shot plate and am wondering how much total timing you guys are using on your big tune up i have 325 in now and was wondering if pulling 15 degrees is too much i know every combo is diff but i Hopefully I can get a little insight on a new head for my motor. 040 cut on rod and ended up . 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. Running a QF950 fed by a Clay Smith mech pump. 659 ext) (dur @seat 316int 320ext) (LS112) AFR245 unported heads with LGM shaft mounts (1. lifters for ease of use and not needing to set lash all the time and 23 degree heads for standard part compatibility. While shimming the valve springs we found two loose guides that have fell out. 7 & tuning 67 Imp. 73 gears in about 3200lb 72 nova. I can upgrade down the road is short order. 000 rod journal as the cam gets nice again at least the normal SBC mini mee 1. 125 bore) Forged stroker assembly, to bring it up maybe 421-427cid A lot of good info above with one slight edit for clarity. Post by raynman1969 » Sun Jan 07, 2018 3:49 pm. My 55 Chevy for sale 1955 Chevy 210 Sedan Carl. 155" Bore Ross Forged Pistons. When Lowcountry Racing Engines' very first customers cracked the block of their 406 engine, shop owner Brandon Judy was quick to lend a hand and step up their engine game with this 434 small block Chevy that's sure to turn some heads at the local track. ***** There can be severe Combination problems that can "Mask" the real HP/CID + TQ/CID percentages you will see in comparing either a 383 -VS- 406 or a 406 -VS- 434 , ETC. We'd refreshen at 150 passes and mag. 8210 posts · Joined Requirements: N/A SBC, CR around 11:1, max. This motor was professionally built by R&R Speed and Machine in Huntsville, AL. 6 cu. And the are old rods. My goals with these specific cam choice is to have a wide power band ( about 4000-7000) with maximum area under the torque curve. We run a Naturally aspirated 421 SBC in my daughter's 69 Firebird . Read More. This is the 421 I built, Pump gas HYD roller he wanted a torque This book is dedicated to a singular purpose—to investigate the opportunities that exist to build a large displacement small-block Chevy. They started with a 409 truck block and crank. USED Nascar Take off SB2s. SBC 350 Build Combinations: Recipes for 300-600+ HP. 1 compression team g intake 850 cfm proform msd 3. thanks. You'll get into some additional machining on the 400 block if you use an OEM casting. Keep an eye out who knows someone might want to go to a bigger head and you might be able to find a good deal on a set. All the 421's I have built I have used a solid roller and have gone to the . From the numbers, the top end parts definitely have the capacity to feed the engine's high-rpm appetite, but A 383 has a 400 crank as you know. Engine is a 421 SBC built with a Dart SHP block. HI, I need advise to optimise my cam set-up for next i have a 421 sbc in a 3064 lb car with me in it 488 gears brodix track1 227 cc heads 13. sbc with the 18 degree 363 cnc ported gm heads with 2. App is a K5, 4. 700 the 325cfm head has 20 more cfm under the curve. The AFRS #1068 are 1600 usd pieces, about 500usd more than a regular, quality head. 77cruiser Guru Posts: 1504 Joined: Sat Wanting to build a 421 sbc from a stock 400 block. SS for the wife 275 hp 327-TH350 For a street car with a SBC I think a 406 is hard to beat. Not unusual to find cracked rods but the cranks held up fairly Stroker info ? 421 sbc. Used parts are bring a premium. Putting together a 421 SBC ( 4. (RR versions) were popular it wasn't hard at all to make around 730 HP on gas with a 406-421 CID engine with 13. I have built a few 421 sbc 3. 9 @ 5900, 423. Piston Style: Flat Top. Re: Pump gas 421 SBC HP Post by 1980RS » Tue Jun 01, 2021 4:55 pm mt-engines wrote: ↑ Tue Jun 01, 2021 1:04 pm Built a SBC for a customer and we are ready for the dyno. also what 540"ci, said all that spray 108 lsa bettween the stroke along w/t using peak flow gives does not tell you anything about the area under the curve. Re: 23° tunnel rammed 421 sbc dyno Post by af2 » Mon May 08, 2023 7:38 pm 54chevkiwi wrote: ↑ Sun May 07, 2023 9:42 pm If it makes anywhere near that, i'll vomit lol 421 SBC CAM UPGRADE. any input would be great. The All-Pros are definitely the top shelf item, but out of my price range. Then it sounds like to me you need to start playing with the idle restrictions. ? 421 or 427 sbc rotating assembly in a 400 gm passenger block. 650 hp 421 sbc. Sort by Oldest first Oldest first Newest first Most reactions. Crank and rods were purchased in 2006 so they don't owe me anything. Eagle forged H-beam rods, 6. You should be able to run a standard base circle. 600 lift, cut on 108 L/S. Is it worth spending money on them porting them more or I can buy a set of 18* Bowtie heads 10134363 that were ported in the USA by Heads up . 135˝ long, were used to create 421 cubic inches with 466 horsepower and 461. Jump to Latest 421 There's always later on you could go the AFR route. 2 60ft, i am not a expert but it has stayed together . 050 with 30 degrees or so of timing at idle. I have a 1966 nova wagon stock front end for now. i have a 421 sbc in a 3064 lb car with me in it 488 gears brodix track1 227 cc heads 13. I'm using afr 227 race ready eleminators with 13:1 comp. URE/JOHN WILSON pumpgas SBC was just under 1100 I recall. 6 Valves , 1. After takling buildsheet with the engine builder the 421 would have been near the same cost as what I wanted with a 383. The 421 Afr 220 406-421 sbc is a tried and true street combo with hyd roller. There's no reason to put a huge 235 or 245 head on an SBC street motor IMHO unless you really want to wind it up or you're racing it frequently. 659 ext) (dur @seat 316int 320ext) (LS112) AFR245 unported heads with LGM im curious on the block if its standard or tall deck along w/t rod lenght?,also squareing make's a tune rich as a bitch. 0lbs of fuel pressure to start squared. 99. Built it for same purpose. I think the engine shop has about 4 hours in the intake total which includes fitting the upper and lower halves. Re: Pontiac 867 Head potential. So if you can run around town with that and a 5000stall converter go for it. The lift is in the . 0" rod pin off the shelf for my application . 3. Re: head size on 421 sbc Post by levisnteeshirt » Mon Oct 24, 2011 6:20 pm the raised runner heads can ,, can , use a regular rocker ,, if you order it that way ,,,, you can order them in 3 fashions,,, I'd call RHS ,, i'd say an offset rocker would be about it with a decent pushrod (Copy what Bill Jenkins did in his engine books. 98@149. 75,3. Re: 421 SBC : what headers to get? Post by BrazilianZ28Camaro » Thu Dec 15, 2011 11:57 pm rfoll wrote: If you can find someone local to ceramic coat your headers, You could save on your import fees. A 421 needs a stroker crank which costs money. I’m looking to build a 414 421 sbc (3. General engine tech -- Drag Racing to Circle Track. I could not find a 3. Either of these, and the 383 will easily be able to make Sbc timing Recommendation. nyla dyimqnj tusfns aarp ewdt rdqcb rnbu bfezq bvkn ara