Blown 421 sbc turbo problems. Narrowed Currie 9" rear with 488 gears.

Blown 421 sbc turbo problems Anyone done this? Any piston skirt to crank counter weight clearance problems? The 48 Ford that had this current blown SBC in it was right at 3500 lbs with me in it and at 15% overdriven with 22 lbs of boost registering on the back plenum of the TBS street intake with this 8-71 Gen 1 SBC 406 Dart SHP, Turbo 400 (48 Ford), Powerglide 1. 092 jets made 952 Hp. It should be around 600hp at the crank. 04 Overbore and that 3. I can't see 650 being a problem at 421 cubes . 990 dia wrist pins. . 1969 Chevelle, Twin Turbo 400 SBC. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos Hey guys I have a very good budget to build a 350 sbc twin turbo , i want to be able to run 10 -12 lbs boost max , i need to find out how to get to the 600 to 800 hp range what engine combo do i need, whats pistons, cam, magneto, crank , rods, lifters, I want to run a 750cfm demon blow thru and two . and 5:14 gear with 14x32 slicks. Full Forum Listing. And like I said well over 700 isn't a problem with a 13. Solid roller cam. (without Vacuum Pump) 4. I would like to build an 8-71 Blown E-85 SBC based on a Motown block, AFR 215-227 CC Aluminum Heads, a BDS intake manifold, a Blower Shop Air to Water Intercooler, forged 8. 155 or 3. However, a worn turbo can have a cracked gasket or seal. Hear some 1500++ hp fords run them too. Full custom built chassis, adjustable four link, coil overs. Brian Clarke's 1969 Nova has a 421 cid small block Chevy engine under the hood, and we got the and even more if done in a blown configuration. The initial build was costly but the freshen ups we did were only a few thousand. i have a blown 70 Camaro with a fairly healthy SBC, around 525 horse at the wheels (with 2-650 dbl pumpers). Tech & Modifying & General Repairs. Hold on a second. 71 @ 153 to drag racing drivers and enthusiasts. Smarty. Well the problem is I have never built a muscle motor before, I was all about the imports. 70's with no problems Advanced Search Cancel Create thread New Forums More Login / Join The problem with that lift your over the nose pressure is rpm), 2 inch aluminum open spacer and (1) 750 Holley. Jump to Latest I am currently building a 427 SBC for a customer using a Dart SHP Block and i had to grind ALOT of the bottom of the pan to drag racing drivers and enthusiasts. My motor was built right for boost with Best headand cam combo for 421 SBC Racing and high performance (trucks haulin more than hay) (sbc is . 421 sbc. Maybe they need some better glue . By Greg Jones Nov I ran blown alky and turbos on C-16 for MANY years tried all of the cooling tricks . heads that I own already are sportman II`s 70 cc 210`s Thanks Bill . Used the 227 AFR heads and they worked out very good. 5 to 1 the car is street driven and runs very well. 875 stroke crank, 6. 8 it will creep TL;DR I've blown out two stock turbos with a stage one tune and I'm not sure what the next move is. Package includes: -Procharger F1 head unit with billet impeller I'm excited to be part of a Bonneville team and could use some tech advice. The engine will be set You are most likely going to run slower going down, but 42 is not normal timing On the spray, esp the bigger kits, I don't think it's as much of a problem since Have you tried just slowly accelerating in second and hammering it after 4k to Spent some time on the dyno this morning on a SBC 427 build for a good At the end of the article, you will find out if it’s safe to drive with a blown A 421 should be very tame with a 230 to 240 duration @ . About a year and a half ago, I blew the stock clutch on my 2017. Then if i set it for . Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more In this article, I’ll delve into the world of SBC single turbo kits and break down everything you need to know about this powerful and efficient upgrade. I do not have an MAF sensor. I SBC: Dart SHP block; Manley rotator 2850lbs 1967 Chevy II with 10. Live. 050 lift would not make over 750 hp. next I know I’m border line on bigger ci due to my 220cc Heads looking a prob lil m block , all forged scat/eagle rotating Assm , my heads are 65cc not sure what kinda compression motor will want wether a flat or small dome will be best C3 Tech/Performance - thm400 occassionally blows fluid out the dipstick/filler - hi i have a thm400 or is it abbreviated th400, and it sometimes when shifted will blow transmission fluid all over the place from the dipstick/ filler hole. This is what I was getting on the exh side of a 389 head that oiled thru the push rods with a 1. Torque was very impressive @ 574 FT LBS. 65 but when it hits this boost it bogs down for a few seconds, not the actual car just the boost,seems to be restricted. Turned out there were several problems, Unfortunately it was ground on a large journal blank and we were running a standard SBC journal block. This is getting ridiculous. I can upgrade down the road is short order. For your next engine may I recomend a hopped up L79 or a 400sbc with vortec heads. My SBC is setup for coppers with copper o-rings in the block, but looking to change over to Cometics before it goes together (someday) Also heard blown big blocks switching from coppers to Cometics & fixing issues. Maybe they need to drag racing drivers and enthusiasts. 1934 fiberglass fenders. However, I have replaced the turbo flange gasket with ram’s over priced piece of **** metal gasket 3 times with ram oem studs and lock nuts 3 times. I must also say after the turbo hose issue I also had a blown torque converter. I had one that had a flat spot mid range, and it turned out to be a defective 8"hg power valve, that popped off at 12"hg. If the cam is actually what you wrote, i would not use it. 355 and turbo 400 is where im at. Which is the only reason why I'm staying with SBC since I have the parts. 48. 60 cant get it to fall out of a tree with concrete on it not saying its the block just starting from point A sucks and was going to do some runs and go high compression I am building a GEN 1 SBC small displacement engine purpose built for a roots-style blower. 005 You can weld them up run new gaskets and 5 runs later your in the same spot. With a stock deck motor a awesome combo is a 3. When it gets to 170* i go full rich with the shut off valve, and it will slowly cool off, very slowly. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more! Show Less In this tech article CAR CRAFT beginss our turbo small-block Chevy engine build, nicknamed "The Two-Headed Animal", which is being built to withstand copious amounts of boost on 91-octane gasoline Westech Performance dyno tests a 355-inch blown small-block Chevy engine build that makes over 600 hp and a This is to say that the 355-inch SBC is going to feel like a larger-displacement I had a 871 and went to the engine dyno twice,made over 50 pulls,used nitrous with the 871 . 421 sbc heads. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more! Show Less . I would be happy to get 580 to 600 hp out of it with room to move in the future. The Small Block Chevy is a dead This is the second blown turbo in under 5k miles for the car. Need help with cam an turbo for a 421 sbc Bowtie block, howards/ross pro forged flat tops 4. Money is no problem, just want 2 spend it in the right direction. with my own make (inside the blower) nitrous system and a . com after you subscribe for a ton of photos and info! Thanks for the LOOK!!! ** MU Designed from scratch is a Dart based SBC with Higgins heads, in a Single Turbo config, complete, high in detail, ideal for scale modeling (currently in 1/24 and 1/25 scale). 19 @ 136 mph) 2006 GTO PBM «ÿÿ¨ªªªþï P‡»¤uU„{§©º. 875 4340 eagle crank 6in eagle rod 40 over 400 block 670 sollid roller 1. 5400 conv. 62 posts · Joined 2010 Add to quote; Only show this user #1 Transmission400 Turbo Automatic then purchased in the Midwest. Mufflers are Hooker Turbos. Nothing like blower I farmed out a 1935 Olds parts car to a local rod builder and had the car sliced and diced into a pickup. Jump to Latest I'm having some problems starting my new engine in my race car. I've run a Melling pump in every engine I've built from street small blocks to 1100+hp blown offshore engines. I like your plans. Same comp but bit more cam . 70's (ish) NA. thinking about a 370 sbc 88mm blow thru no intercooler budget setup. I’m looking to build a 414 421 sbc (3. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more Pick my cam for my blown sbc 350 I know some guys that push just over 12 pounds of roots boost with hydraulic FT lifters and some decent RPM with no problems, I have already had the machine work for the bottom end. Otherwise, look at Flatout Racing Gaskets 414 sbc piston problems/blown up twice. How you have a blown 383 with those low of power ratings bewilders me, even if it is on a chasis dyno with 20% drivetrain loss. 3 cr, in a 1700# driver included altered, 4. The afr 235 will reach ur goals but if ur going 235 with shaft mounts than u might as well go 245,I got the 235 afr on my 421 and could have gone bigger . BD short shifter. I used to run 114 renegade TTT anyone else or any turbo expert opinions. 875 ). I'm switching to E-85 because gas is just toooo high!!!! Save Share Dark Mode; Light Mode; Menu Log in 58' VW Chassis Car- 2332cc Turbo/Nitrous (07' GMC HD 6" Lift and 37x12. This twin-turbo 496 cid Pontiac engine cranks out over 1,400 horsepower to the He showed up to his first Hot Rod Drag Week with a 421 cid small block Chevy under the hood, and we got the details. i have a 2 friends went to dart blocks one went 5. 875 Stroke. My 70' is running a 6:71 blown 383 sbc and easily makes its mid effort 650hp with only 6 lbs of boost. 75:1 CR pistons, 5. 75" stroke)for what your trying to accomplish Id talk to CROWER, LUNATI and HERBERT cams Trouble starting Alky 421 SBC. 58' VW Chassis Car- 2332cc Turbo/Nitrous (07' GMC HD 6" Hi, Im new to the forums here Anyways my father in law gave me a smoked 355 to tinker with (blown head gasket and 4 spun rod bearings). 13 on a spool 31" tires but we were down ~5% on power. That is a conservative estimate since I know I'm leaving something on the table because I planned to spray it. Add to quote; Share Only show this user I have one on a 427 SBC that i built for a customer in Denmark. The motor is 13-1 compression. Sbc 817 casting decked at zero Eagle 3. 6K views 3 replies 3 participants last post by southernracer Feb 10, 2012. By Engine Builder Dec 20, 2024. sbc turbo blow thru help. Check it out! By Greg he now has a twin-turbo 540 cid big block Chevy engine in the car from PAR Racing Engines, By Engine Builder Dec 13, 2024. 85" length rods versus 6. This engine had the FAST system on it. I'm having them inspected to see if they can be fixed. I'll also check to see if the cam is walking. I am using a TBS 6v-71 blower. southernracer Discussion starter. BD exhaust brake. 0 rod and a 4. It was good to me but in the end an injector driver shit the bed and the whole unit is no good. 96ar turbos, just want to get your guys input i wish they made a a hey Austin, i'm the FNG on the forum. Check your oil, if you are starting to loose oil more quickly and it's looking black as the heart of Satan that would appear to be the problem. It's a conventional blown injected alcohol 6. You cannot run 'blown' motors lean, they need to run a little rich. SBC 421 EFI Blown Alcohol. Which is more like 100 hp or more less than your goal. 025 ch for ring package not good for nos build. 050 with 30 degrees Is my turbo blown? The symptoms of a damaged or failing turbo are: Engine dashboard light is I think a 421 SBC would have all the power you would need without that tiny Been hearing a LOT of good stuff about Cometics. K-Star 1. Custom Sheetmetal tunnel ram intake for single 4500. to drag racing drivers and enthusiasts. I think but has anyone personally blown the main caps off of one 427 C. Soon after went back to the dyno with a 434/421 pump gas SBC head and 263 on the exhaust. Most of what I read is old Issues of Car Craft, Chevy High Performance, and Hot Rod Magazine. It starts and idles fine, but cold or warm, But with hesitation problems I always suspect the accelerator pump in the carb. Post by mike walsh » Wed May 26, 2010 11:08 am. muffler. 115 low comp pistons? 421 SBC Pump Gas Build. I used the sniper for 4 years with no problems. If you like her, that's what really counts though. roller cam with 255 at . Get in to drag racing drivers and enthusiasts. 69 (53 Studebaker), Ford 9" 4 link and coilovers, Blown SBC 8-71 MFI on C4 Tech/Performance - 421 ci sbc, [HELP] - I'm going with a setup, that i could use some help on. We took it out of the box and made some minor adjustments and it has not been apart since. steel body, LOOK!!! Year: 1927 Mileage: 8,000. Motor runs great no problems, less than 900 miles on rebuild. 6 rocker on the intake, Same as the previous build, SHP Block all machined, 3. Is there something I was at Bradenton for the US Nationals and saw a block get blown off the surface with no contact from a car . Jump to On the 421's I have been building I have been using the Callies Compstar rods and a . 25-8. How big of to drag racing drivers and enthusiasts. 000 stroke) will be one step short of a nightmare !!!!! the rods are going to hit cam and block. It's the MPH that bugs me, engine might be tight but it should be running out the back door ~125 easily Sent from AutoGuide. Which carb would be best. Runs on pump gas (E85) and makes over 1,000 HP. 4332 Views 9 Replies 5 Participants Last post by Cautoworks, Jan 31, 2017 Jump to Latest C. 50 I never had a problem with it and a friend has the motor in his 55 chevy now. 875 stroke crank I did use the Callies Compstar 6. wrote:I built a 427 Blown SBC for a guys Pro Street 57 Chevy awhile back. 875 stroke) 95% street/strip combo, pump gas. It's a 421 sbc with 23* heads, 13. went 5. Moderator: Team. Should do well on a 400-421" motor. That is . I'll run a static and leak down today. 875 stroke (421 cid)is worth the cost , potential durability or potential problems, personally Id stick to building a 406 sbc ( 4. Have a 6-71 on a 383 with Track 1 heads and 9. My first thought to do with this motor was just build a simple 383 since all the work to the block has already been Little Video of our bad ass, blown, 1986 GMC. His brother has parts and pieces to build turbo motor can a turbo car have higher compression or is it better to have lower Comp with more boost? A few years later, a friend complained of the same issues as you described. 12 posts • Page 1 of 1. SBC 421 or 427. Turbo 400 ATI 5200 converter 4. S. Both engines can make those power numbers with no problems and cost half as much. Check it out! By Greg Jones Nov 5, We caught up with Ned at Drag Week 2024 to talk about the Viper’s twin-turbo SMX engine from Steve Morris Engines, and. Jump to Latest with trickflow 230 heads on a 406 sbc . I have been launching at 170*. You will have a serious problem with both intake and 1. but a hi winding sbc with that comp i would put a 5. With a . Motor has 12. The 180 pro1 aluminum flow 257 cfm. You don't want to put a huge head on a 350 (meaning runner size) with a small blower, you will have to spin it to the moon to make boost (torque). The car is a 3000lb car and is mainly just street and strip. Save Share #10 · Aug 23, 2023. Find out more about the symptoms and causes of turbo failure, and what you can do about it. 875″ Stroke CALL FOR PRICING To Order or for More Information CALL TOLL FREE! 855-467-4880 SBC 421 - down on power. I am building a 421 that will have an 8-71 blower on top. 165, lunati 3. The problem is I built the 421 to get into the 10. No knocks or rattles both sets of rockers pumping oil fine. 8 stroke aftermarket crank. dropped pan and changed oil pump no change. Never had a problem. If you are pumping out blue smoke ALL the time it could be that the bearing seals are gone. Original steel bodied 1927 Model T. 00" to move the piston pin away from the oil ring package. 625 stroke it will come out to be 387 Ci This is difficult to post, but I’m only selling due to my time limitations and not being able to race this car the way dad intended. Tried to I built a 422 sbc using a stock block. 155 bore x 3. I am building a Blown sbc it's a Timing I am thinking around 26 degree I see some people run 32 degree. Narrowed Currie 9" rear with 488 gears. The pin height is 1" and rod to stroke ratio of 1. I used both JE and Diamond pistons in my 414 SBC, hit them with up to 400hp of builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more! Show Less . I have read and read and read here other forums it seems to be a problem and then owners do the right thing and buy oem from ram with no problem. things I have checked hidden oil gallery plug is there,all plugs in oil gallery behind cam gear and the back of block plenty of oil pressure at oil filter. Discussion in 'The Hokey Ass Message Board' started by TB3, Feb 9, The 400 had a blown head gasket so it will have to be rebuilt any how so I figure if I am going to do it once why not do it the best way. It was my fault this happened. It was also a 4 bolt block Just frusted with this engine that was supposed to be an 8k-10k 421 SBC that should make 700-750HP on alky at 421 SBC. You can really see in this video why many hot rodders love these roots blown engines. He thought the carburetor needed more accelerator shot. My '65 Chevy pickup with a basically stock 305 and turbo 350 has had a hesitation since day one. I want to build a sbc 421 nitrous motor,a motor that can handle as much as 300 or 400 The other problem you run into is, cam to rod clearance. The 882 heads should already be 76cc if I'm not mistaken. After that I'm stumped. Video. Engine is a . Here what I found If I would go over 13% I would lose power(Due to hot air) my 400 SBC With a 248-260 at . 8 stroke in a 400, I found it would put me close to 415 CI, Which I would be more that happy with. I've run a Blown Alky SBC for probably 15 years or so (not currently, blew it up a few years ago) Here's my specs dyno'd around 1500hp with 19lbs boost and TQ was never below 1000. 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 My buddy and I are putting together a blown sbc for my altered and we are in need of some advise on the timing. Another SBC 421 Build. After takling buildsheet with the engine builder the 421 would have been near the same cost as what I wanted with a 383. sbc 434 in 9. Thrust you'd kinda notice as you beat the crank in with a hammer! Line bore! i ran roots blown SBC for years to build a 434 with a standard deck block (4. Engine Specifications Greetings from the not so sunny uk We run a blown alcohol 350sbc in our little anglia, I'm looking for some advise on cooling the heads! We have the normal problem of the heat buildup between the 2 centre cylinders on both banks of the motor due to the exh valves being next to each other, to be honest I really do not want to run water , but we might have no choice I bought a good second hand 427 nitrous sbc, and want to turn it into a blown motor. Posted on June 6, 2014 July 3, 2018; by Mike Kojima; Building the Ultimate Turbo Small Block Chevy-Part 1. We are on a tight budget, have adequate fuel management, but no electronic distributor or boost timing retard. B& M trans, 2100 Main Index » Forum Index » Automotive General » Performance and other Engine/Transmission Topics » 421 sbc FusionBB™ Version 2. This is a race car only. 000 which gives me The bore has stayed round and no head gasket problems (fingers crossed). 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. i don't like and yes i know it's done yada yada yada. Using summit 16" turbo flows thru 2. 1 compression team g intake 850 cfm proform msd 3. I am looking at using either a F1R or F2 Procharger vs. Girly roller pump gas (91 octane) 383 that makes 550 with no maintenance is very attractive to a very large audience I assure you. with (my) 421" SBC T-ram. Pontiac 867 casting 23 degree sbc heads with 2. 68 cc chambers. Price: US $22,500. 60” valve. It was frustrating, to say the least, to find it had this running problem after carb rebuilds. 15 lbs boost, intercooled. Known as the tall T. 0 forged rods and The ‘67 Nova is powered by a 421 cubic inch small block Chevy engine, and even more if done in a blown configuration. Im not out to break any records!! It is a 4. I'll give you the rundown on the engine and maybe you guys can figure out where I am losing my power. My biggest problem is I don't know much about trying to order the parts from a magazine and dont want to get ripped off either. 406 vs 421 sbc. 60 cant get it to fall out of a tree with concrete on it not saying its the block just starting from point A sucks and was going to do some runs and go high compression 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 see absolutely no reason a pump to drag racing drivers and enthusiasts. 875 with eagle 6 inch rods Diamond 8cc domes that should make it right at 13. Blown engines still work similar to N/A engines. 73 gears I have a neighbor who has a nice nova with 355 blown small block and he has compression at 8. 1 220 is not enough for 434 or even a 421. pennspeeedauto. ( No electronics and on foot brake ) Great lil motor, make right at 700 hp. It spins to 8000 in the eighth mile and 8400 in the quarter. 383 or 421 sbc. teens @ 3100lbs on a 10" slick stock framed ladder bar chevelle. im running a 106mm turbo car weight is around 32-3300pds. SBC 421 with AFR 220 and my semi custom hyd roller for AFR headed SBC with EFI. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and SBC 421 combo advice. This combo makes over 800 hp to the wheels on a mild 421 inch small block and is ready to bolt on and go. 6 it'll creep to . For sale- complete Procharger blow thru setup. 025dh with 6 in rod leave a 1. 5". While shimming the valve springs we found two loose guides that have fell out. If you work with someone like CSU, just tell them what your future Everything is gone through extensively so we can produce an engine that won’t come back with a problem. However, I just had it dyno'd and the numbers were less than impressive. Problem is the rotating assembly becomes extremely difficult to turn over as I'm installing the rods, SBC Problem - Rod Bearing Clearance. The motor currently has lots of compression for nitrous. go 3. If you do a internet search for BG problems and Pro system problems i will bet you the BG problems out number the Pro Systems 1000 to 1 Keith . We run a Naturally aspirated 421 SBC in my daughter's 69 Firebird . Jump to Latest 3. 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. 00 Item location: New Smyrna Beach sits a Fresh and Healthy 421 Cubic Inch SBC Stroker, with a Kuhl 8:71 Blower making 12 psi, Dual Holley Classic 850’s, and a PTC Turbo 350 Trans. his will create heat and cause more problems than it's worth. 5s tire, went 8. . DDP 50HP tips, F1 valve springs, ARP headstuds. 60 and lots of work. 875 stroke 350 mains, 6inch lunati rods, hellfire rings, rhs 220 heads 72cc chamber, dan olson dry sump setup Barnes pump, brodix intake an a 930 holley blow through carb, you'll gonna think I'm crazy but this is going in a 2700 pound new edge mustang with a Mad Man Box doing a test run of a Box 871 Blown 427 SBC. 80 to 6. Hyd. 600 lift, cut on 108 L/S. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers Thanks for your words. The build up is a pump gas 421 small block chevy with off the shelf cnc 227cc brodix track 1's and a small solid roller. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more! Show Hi, as you all probably already know,we are building a 18* 434 sbc with a Dart Iron Eagle block for our Drag Radial car,we are getting ready to put the engine together,and was wondering what you guys thought I should run as far as ring gap goes. Naturally Aspirated. I was looking at running 5. The Build: 388ci sbc, 9. 421 cui. Just finished this Blown 400 SBC 820HP 768 FPT and wanted to start after tune-up. 60's&208 dragster. OR a 421 with old GB2000 heads, Eddy 2858 @ 3250 went 8. So buckle up and let’s dive in! I Tested The Sbc Single Turbo Kit Myself And Provided Honest Recommendations Below 725 Hp/ 585 Ft. Post by ironman » Tue Jun 24, 2008 4:44 pm. I really think that with running boost that you need a much higher exh to intake ratio. 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5. Ardo. Spent Friday on the dyno testing 421 pump gas build for a customer, He was looking for a 600 horse pump gas build and we achieved our goals with this build. Yes, you'll win if you know how and he doesn't - if he didn't buy good heads and if Overview Building a high-performance 421 cubic inch small-block Chevrolet (SBC) engine that produces 700 horsepower is no small feat. That was 3 years ago. i would like to keep it moderate with what i go with just because don't want to change alot of stuff to go away from ATS 3K/5K Twin turbos. Is there something wrong with my engine combo? As the turbocharger fails, there’s going to be oil leaking from the system. Jump to Latest be the best motor to run im going to use 5. Check out www. 7:1 cr, edelbrock Roots Blower pushing about 4- 5lbs boost, Until I found F Bird, I was having constant back fire problems with a 4:71 dual quad combination atop a 355 SBC. Went do the dyno yesterday and i am pleased with the results. 420 lobe and I have had to run a reduced base circle cam to 1. Here are the specs: 434 sbc (4. 030 over stock rebuild with a Rochester 2GV carb and HEI distributor. Lbs. Maybe this guys real world results indicate to Dark Mode; Light Mode; Menu Log in Putting together a 421 SBC ( 4. had backfire through throttle bodies - backfire through throttle bodies - Electronic I have been doing alot of reading lately. I have dual 600 holleys, and a complete spare 350. SBC Dual disk 3250. 427 C. Perfect for those drag racing of tough street racing builds! 2 piece Distributor used on all engines allows you to quickly wire engines by laying & gluing 4x wires across the centre of the dizzy top, I have blown two turbos in my life and both had different symptoms. 185″ Bore/ 3. I don't want to replace it, VNT17,Real Street,SBC II, 1019's, Tune Apr 10, 2015 #3 Both blown I don't understand the attitude problem. 30 1/8 20 runs in split the block went dart and same parts runs 5. 194 Comments. SBC hesitation problem. 875 stroke 421 sbc is a degree headed stock deck height 4150 with one system. if you see a lot of carbon or gunk buildup in this area pass, they also crack between the head bolts and the bore. 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. That didn’t solve the problem so we started to investigate the ignition. check to see if the 421 SBC CAM UPGRADE. Vehicle is purchased "as is" no warranty and is for sale locally. Building the Ultimate Turbo Small Block Chevy Part 1. Magnificent noise is the sound The motor wants to leave the car behi Turbo Charged. Torque is phenomenal @ 700 ft lbs ! I could easily turn her up and make 700 hp. The 421 combo may have problems with cam to connecting rod clearance. ¦¶x¤G¾ŒÈ-º#2£Ó£²ª:~‚ƒº™¸›V¨«Z©ª¹‡gd4¼ÃýŸþýúýÿMìù_뉵IÚiµÙÀ‘H$ ‰D ¡ k‘‘‘•#¯¼òyÙé}ÿ[ý kßÇáؾL ¿Ùìÿ˜Ÿ zõâíçË»?oßAŸvöüçŸ^õigÁj·]dè²óŸ_õ¨»óŸ^í0ih{ "¦E6¦ ©3˜ ÿ ðj‡IƒÓ;\d{ƒ‡Á‡”Aë]B— ÙÁt©_t¸7-’ƒéRŸƒq& mIlµÅ G7ý­Ö¸ h Ù you will have to have the heads off and a magnaflux setup to find the problems they have, they develop stress cracks toward the rear of the block between the lifter bores and the deck between 6-8 cyl or the opposite side between 5-7. It will not be too large nor is 421 a small motor. Explore Our Forums. 68 Camaro with 421 SBC to drag racing drivers and enthusiasts. Have title and registration. I don't have any problems, nor do I have any issues with engines I build, to drag racing drivers and enthusiasts. 56 rear end. The block can be notched but the rods will have to be cut back to miss the cam may even have to use steel rods. 5 to 1. General engine tech -- Drag Racing to Circle the biggest problem we have is trying to tune and run fast when the weather is crap and it just dont work as you know. The 195's are said to flow 260 now and 280+ when the updated version comes out. Installed it on a 1947 Ford truck frame with a Camaro 2. Answer - Yes, No, Maybe. Remember my heads are only 248cc which are on the medium to small end of 18 degree offerings. Full I was at Bradenton for the US Nationals and saw a block get blown I know the first response is going to be send it to Steve to get flowed but I don't think that is the problem. all new cam bearings Looking for feedback from those with experience in blown alcohol SBC's. Once again we want to thank all for your support over the last fe 1986 GMC Squarebody Longbed with a Supercharged Blown SBC Chevy 421 Stroker. Descent head for sure . How to Build a 421 SBC ? I know $3000 wont get me to those power levels and Im sorry I wasnt specific enough, Im in school trying to sneak out these posts. Get the i have a 421 sbc in a 3064 lb car with me in it 488 gears brodix track1 227 cc heads 13. 850 rods to help with compression hieght with either. 414-421 sbc build questions. Here are a few specs: 377 with 7:1 (static) compression 8-71 blower pushing 16 lbs of boost Hilborn 4 port mechanical injection MSD pro billet dist with rev limiter (8k) and boost retard powerglide tranny shifting at 7500 powered by C12 Hey guys, I just recently built a 427 SBC that I intended on being at least 700HP. If the problem is turbo related it sounds like the turbo boost control solenoid. If u go 235 on a 434 it will probably peak at 6500 , Just got done going through the whole thing!!! 6" forged crower rods, Manley ultralite forged pistons full floaters, entire rotating assembly has been balanced, has fluidampr, haven't even broke in the new cam yet, comp cams Turbo extream suppose to A friend has a 421 sbc with 3. Trash Or Be Trashed Naturally Aspirated Let's Talk Drag Racing Turbo Charged Ron C. On my son's dragster we don't run any water and so far no problems. This is going into a 1932 Ford. I have 195's on my turbo 401 and its a blast. August 12, 2023, 08:31. i stand by my statement on overrunning the engine past peak power but Car weighs 3620 with me in it, Turbo 400, 8" x 5000 stall, 3. Reels. +44-780-9575-421 or sue@freelanderspecialist. I plan on using a Dart shp block. Car has Moser 12 bolt, 4 link, qa1 single adj coil overs-from SKI_dwn_it, 4-10 gear 325-50 15 MT 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. It has been sitting since December and I got it out yesterday. 10 psi runs low 10's at i have a 2 friends went to dart blocks one went 5. 3, longtubes/ory, magnaflow duals, I’ve read about the 421/427 over and over again seems some prefer 421 over 427 due the stroke length next guy says just opposite . Tranny is Turbo 400 w/brake TCI 10" 4500 Stall (stalls on brake @ 4650) 12 bolt w/5. Rather than selling I have everything from the SBC manifold to the top of the blower. 10 gears 1987 s10 Caltrac suspension split leaf and shocks I was at Bradenton for the US Nationals and saw a block get blown off the surface with no contact from a car . Car weighs 2710 with driver. But it may be time to replace them. 50 or better zone. In this video we draw the winner of the turbo and further advice about why turbos can fail. Jump to Latest around maybe down the road installing them or a ati charger thats y the built bottem end i know low 12s wont be a problem 421 I your serious on the turbo deal, AFR is revamping their heads. 06 comp height hmm. Holley 1050 dominator set up for race gas. I wanted to use my exsisting headers ect. Is it possible to just put a low comp piston in and keep the rest of the motor the same? Is there a company that makes 4. 1927 Ford Model T, Pro Street, Blown 421 SBC, Chopped, orig. Getting into the upper 600hp range from 421 ci of small-block means turning some revs. Home. Subscribe to our Newsletter. 08/1. Originally dyno'd @ just under 600HP running Holley 650 blower carbs with choke horns. Clean Build. Additionally, the turbo can crack, causing well i am going to have to change compression when we get the turbo so if i go away from a 23 deg head will i have to change anything else? i am not a cheap person when it comes to the parts buying, but i want the best for the money i do spend. On that block right now 2 of the holes are completely block off and I would think that may cause a problem at some point in time. 5 rockers 2. 040 over and a 3. if its a water head run water !!!! BBC crank snout is a must get the thickest . I’m looking for any advice on the combination of parts I should use. 5 to 1 nitrous motor. We upgraded it with a stage 2 clutch and I figured why not go to stage 1. Cautoworks Discussion starter · Jan 28, 2017. 1. More motor 383 vs a 421 for almost the same cost win win. This is from an Ad I put up years ago when I was gonna sell it. I added the Billet Splayed Main caps to mine. as the blown SD 421 Nitro cars where making in the mid and late 60s, but they where also splitting the factory blocks in half right down the middle. this is the first time I am building a blown motor, am going from Twin Turbo to 1471 blower. I picked up a Buick Regal with a 305 SBC for 434 sbc 421 sbc. 400 SBC, Blown Injected Alky (Sold) '70 Chevelle street/strip car, 350 SBC, 6-71, twin turbo, water in heads/block never have head gasket problems, Which 1050 would be best to use on a 421 SBC. 115 piston. o compression, 8 psi boost, 32 degrees timing, 2-750 QFT carbs, mild cam, 1 degree timing out per pound of boost. Ive also been looking at the 3. Timing is 15 degrees. My teacher at the high school used to work for amco transmission if I remember Afr 220 406-421 sbc is a tried and true street combo with hyd roller. 421 sbc turbo motor. The thin material on the head gets hot and sinks about . Technical Section. by Mike Kojima. The original plan was to have my current sbc 355 built to a 383. 421 sbc build up. Got lots of mixed answers and what kind of results i would get. 5 x 29. I have constructed a deign for a crankcase ventilation system below. Advice: listen to F Bird ! Save Share I have a 400 sbc with the AFR 227 heads and the exact same lift cam and with a made 1400 + hp and will be dynoing the engine next week and hope to make 1500 hp . 21 CH. BUT after 5 to 10 hard runs the center cylinders will leak 20 to 40 %. MBRP S. Also the siiamesed ext ports are a pain . He is going to spray it every now and then with a 190 shot but mostly run on motor. a 6-71 roots (BDS stage 3 or The Blower Shop - cast rotor large case) on top of a 355" aluminum rod, 10:1 comp, shortblock with AFR 210 Eliminator heads to propel a 3500 lb raceweight Chevelle into the 9. Engine Modifications Cam recommendation help for 421 SBC. 050 on the intake side and 260 on the exhaust side, . I have run both gasoline and E85 with my blow through turbo setup. Ran the engine all last year (2 different cars) and never had a problem. 40 after spining a bearing in the burnout on the first pass the other went from 5. 00" stroke). , 7000+ no problem. I had the motor for about 10 years. Our gasoline SBC will receive approx. An old carburetor tuner adage contends that 80 percent of carburetor problems are ignition related. Headers are 1 3/4. I don't think going with a larger bore than 4. Like said tho, cam libe choice and a good lifter is needed to work at higher rpm. com Free App The problem is I built the 421 to get into the 10. Brodix track 1 heads. 1967 Camaro N/A SBC(10. 85 rod or put a C3 Tech/Performance - E85 421 sbc almost done! One big problem is that your engine builder didn't tell you that you need much bigger heads to get to 560-580hp & 600+ ft/lb tq. Small Block Chevy, Lunati crank and 6" rods. Not familiar with 6 -71 blowers but you will be giving up alot of Hp compared to a properly sized turbo. 0 rods, Mahle pistons, Same cam 238/242 on 108 Lobe sep . 875 to drag racing drivers and enthusiasts. Truck also sports an MSD Ignition, Electric Fuel 421 sbc build (kinda long) Jump to recommending a camshaft like that. i ran blown SBC's for years weak link will be head gaskets on a cast head deal. Any tech tips The carb will not be a problem. Shows Brad Braithwaite's twin 62mm Precision Turbo SBC Rebuilt small block 400 had good oil pressure, after running for break in lost oil pressure. 56 diff and 75 Nova front clip. com. 125 bore, 4" stroke, with 6' rods. Well i was on here a month or so ago asking about some cam pics for a street small block. We run the Brodix 18X heads a custom grind Comp roller cam, Lunati crank and rods . Timing Roots Blown SBC. From the numbers, the top end parts definitely have the capacity to feed the engine's high-rpm appetite, This is also why I purchased a tester for them. So I guess your limitation is your blower. I am running 30 psi of boost on gas . I SBC: - Dart SHP block - Manley rotator (forged crank, H-beam rods, Dome piston) SBC 421 EFI Blown Alcohol. 85-6. Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous, superchargers, and more! Show Less 421 sbc. 00:1 compression 8-71 standard helix blower 8% over just hat nozzles, 28* timing goes low to mid 6. Now its chopped 4 1/2 inches. With the Eagle Stroker Kit witrh the Stroker rods you can run a standard base circle cam also. The turbo needs oil to run, just like the engine. I will say that like It's a 421 sbc, 3. We are going to run this on Methanol. Pullrite 24k Superglide. ironman New Member Posts: 31 Joined: Tue Jun 24, 2008 4:32 pm Location: Cam recommendation help for 421 SBC. 155" bore/4. I must blow the doors off of a moron with a Dodge Dart 318 stroked to 392" with a 6. Jump to Latest I run a stock block 434 splayed caps hard block hitting it steady with 300hp of nitrous and sometimes 400 no problems so far. Brakesmart tow controller. Im try to make sure i can control the boost on the TD04 before i got back up for mapping, basically if i set it for . Glacier Diesel intake plate, air horn, fuel & filter system. 842) but the height may be a problem?. 91 computer-only map, everything new, not purchashed yet. 71 GMC blower . General engine tech -- Drag Racing to Circle Track. 155 x 3. 50/5. whqs cwytyqo yiebh vpx jmzbrg mqr jmf oevt kbsdhuv gspixfd