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Old 04-22-2009, 03:34 AM   #1 (permalink)
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4.3 high perf build

i am getting ready to tear into a 4.3 for my sammy and have a few questions. I know i can use alot of parts for a small block for my build because i want to lighten up the bottom end. I am not looking to get gobs of power but i do want alot more RPM out of it.( 8,000-8700 redline) I know that this will suffer in the bottom end but im not lookin to creep around anywhere. My main concern is about fueling it, I would like to run a throttle body but im not sure about the computer and sensors on a built motor. Who would i contact for computor remapping etc? Would i be better off to build a carbed motor with a truck avaenger?
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Old 04-22-2009, 09:13 AM   #2 (permalink)
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Originally Posted by redneckryder84 View Post
i am getting ready to tear into a 4.3 for my sammy and have a few questions. I know i can use alot of parts for a small block for my build because i want to lighten up the bottom end. I am not looking to get gobs of power but i do want alot more RPM out of it.( 8,000-8700 redline) I know that this will suffer in the bottom end but im not lookin to creep around anywhere. My main concern is about fueling it, I would like to run a throttle body but im not sure about the computer and sensors on a built motor. Who would i contact for computor remapping etc? Would i be better off to build a carbed motor with a truck avaenger?
Start with a 454 TBI unit. I also HIGHLY recommend the 16197427 ECM as it is the latest TBI ECM and is the easiest to program. Also, your truck will run best if you program it, or have someone else program it with the truck in person. IMO mail order tunes leave a lot on the table.
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Old 04-22-2009, 03:52 PM   #3 (permalink)
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lots of this info over on s10forum.com...

Good luck getting the stock "split profile" type crankshaft to zing 8k repeatedly...and an aftermarket will set you back THRICE what it should.
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Old 04-23-2009, 08:03 AM   #4 (permalink)
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Quote:
Originally Posted by redneckryder84 View Post
i am getting ready to tear into a 4.3 for my sammy and have a few questions. I know i can use alot of parts for a small block for my build because i want to lighten up the bottom end. I am not looking to get gobs of power but i do want alot more RPM out of it.( 8,000-8700 redline) I know that this will suffer in the bottom end but im not lookin to creep around anywhere. My main concern is about fueling it, I would like to run a throttle body but im not sure about the computer and sensors on a built motor. Who would i contact for computor remapping etc? Would i be better off to build a carbed motor with a truck avaenger?
Edelbrock has a performer intake for a 4.3 for around $250 thats supposed to be fairly good. The only problem is thats its not a fuel injection manifold. But if your willing to convert to cauburated(sp) its the best way to go for the money. They also have complete top end kits, but they're a little more expensive.
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Old 04-23-2009, 08:11 AM   #5 (permalink)
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Originally Posted by metalmatt47 View Post
Edelbrock has a performer intake for a 4.3 for around $250 thats supposed to be fairly good. The only problem is thats its not a fuel injection manifold. But if your willing to convert to cauburated(sp) its the best way to go for the money. They also have complete top end kits, but they're a little more expensive.
That really isn't a problem if he uses a 454 throttle body since the early ones came factory with a heated adapter to a quadrajet intake. Even if he can't find one of those there are adapter plates all over the place from the TBI pattern to both square and spreadbore intakes.
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Old 05-28-2009, 12:57 PM   #6 (permalink)
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what if i went with a 4.3 vortec motor instead? It is going in a sammy that has virtually no wiring( push button start etc, cause i hate wiring.) Where would be the best place to get the stand alone harness, computor etc? What year motor would be the best(most power)? I am gonna use it with a toyota 5 speed and dual cases.
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Old 05-29-2009, 01:19 PM   #7 (permalink)
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Stay away from the CPI vortecs. Injector nightmares, and no real gain in hp over the tbi setup. The highest rating ever was 190(195 if you got a zr2 some years) hp in the S10. Silverados got 200hp towards the end of their life. Easiest wiring would have to be TBI, anything from 88-91. Just grab whatever computer is in the donor vehicle and get a chip burned for it. Good luck on the performance part. I tried to copy the Hotrod mag 300+hp build and it would have cost over $5000 with machine work + parts. Alot of parts might interchange with a sbc, but whatever ones don't be prepared with some KY cause you'll get raped If you're using a yota trans and really care about top end....Why not go with a 20r or 22r & add turbo + propane? Check out syty.net if you want to get an idea of high dollar 4.3 builds.
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Old 05-29-2009, 07:47 PM   #8 (permalink)
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Carb it as use propane. Have you had any thoughts on that?
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Old 06-03-2009, 01:45 AM   #9 (permalink)
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8000-8500? buy every 4.3 you can find.....I guarantee you will be replacing them often


My 2006 4.3 vortec falls flat on it's face at 4500....with the stock rev limiter removed

Last edited by Black06; 06-03-2009 at 01:47 AM.
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