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best engine swap for 4.3 sierra?

best engine swap for 4.3 sierra?

Postby 89frankentruck [OP] » May 17 2012, 11:40pm

I'm trying to decide what would be the best engine swap for my 89 sierra. I was thinking maybe a corvette motor, traditional chevy 350, or a rebuilt 454 from an chevy. What would be the best engine to put in my truck to where the would be minimal modifications to the 4.3 mounts? If I put the 454 in, how could I change the set up of one to where it is set up for performance, rather than pulling/hauling?
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best engine swap for 4.3 sierra?

Postby WrensLawnCare » May 18 2012, 1:04am

Id say a 350. When I get on the PC I will try to find the article where a guy stuffed a 454 under the hood of a s10 blazer. When I say stuffed, I mean STUFFED! Was a good read to I believe.
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Re: best engine swap for 4.3 sierra?

Postby ASTE25 » May 18 2012, 1:14am

Hands down the 350 will be the easiest. You should be able to retain the factory engine mounts, if not, the frame mount points will be the same. Also I believe the front accessory mounting brackets and all will work on the 350. You may just have to have a longer a/c hose made for the length of the extra 2 cylinders on the 350. I'm sure there are other things that will need to be done, however, not nearly as much as going with a big block.
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Re: best engine swap for 4.3 sierra?

Postby deathphoenix99 » Jun 14 2012, 2:16pm

Engine mounts are different, but you can buy stock ones at least. The computer will work as well as the wiring harness, but you need the computer chip for the 350. The accessories should work and a lot of other items stay that same between the two.
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Re: best engine swap for 4.3 sierra?

Postby lilmagoo1 » Jun 14 2012, 2:26pm

I had a 98 full size with a 4.3L i blew it up and added a 350 i needed a whole new computer and wiring harness other then that everythign else mounted up perfect. it is still a 4 bolt main chevy block and all the engine mounts were where they needed to be in my case at least...it should be the same in your case as well its a 88-98 model series. when i wrecked mine into a tree 4 wheeling i used a 89 core support on my 98 front end and it fit perfect!

id say a 350 but my buddy had a 99 2500 ( same body style as what you have) and it had a 454 in it stock...it was a 4 door 2 but it ran like a son of a bitch i tell ya that!
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Re: best engine swap for 4.3 sierra?

Postby deathphoenix99 » Jun 14 2012, 2:37pm

If he swaps in a TBI 350, it uses the same wiring harness. You had a SFI truck, and you could've gotten away with adding two wires for the fuel injectors and a tune or ECM swap.
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Re: best engine swap for 4.3 sierra?

Postby lilmagoo1 » Jun 14 2012, 2:56pm

well i got it running and in timing and rolling and ran like crazy!
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