old 350 swap to 350 H.O. lots of ?'s
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Junior Member
Joined: Jul 2003
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old 350 swap to 350 H.O. lots of ?'s
Ok, a friend of mine directed me here. I've spent a good hour or so sifting thru various forums and searching TBI related messages. I still have a few unanswered questions that I was hoping you good people could help me with.
I have a '92 Chevy K1500 (Z71 4x4). Stock form it has a weak 350 TBI (in new form lucky to put out 225hp).
I want to swap this engine out with the GM Performance 350 H.O. (330hp / 380ft. lbs torque) However I want to retain the fuel injection, but on the other hand don't want to spend a fortune on a TPI or MPI setup.
My plan was to buy the H.O. engine, Performer intake, use TurboCity adapter and mount Holley's 670 TBI unit (Jegs P/N 510-502-6) which has 65lb injectors (as I was told by Holley), and then either have my chip custom burnt (locally) or buy one off the net...oh yeah and of course a new fuel pump and adj. fuel pressure regulator.
Questions:
Will I run into any trouble swapping over all my accessories, etc. between these two engines? I read in one post that there is some trouble using the old stock flexplate / flywheel?
Can I use my stock balancer / dampener?
Will the engine even run with the stock computer / chip programming? (so I can drive it to be reprogrammed if need be)
Is the 670 with 65lb injectors enough to feed this setup?
Will I need any new / different sensors?
Do the stock manifolds bolt up? I'll probably buy new shorty headers anyhow, but was curious if the Vortec's have a different pattern on the exhaust.
Thank you greatly in advance!
I have a '92 Chevy K1500 (Z71 4x4). Stock form it has a weak 350 TBI (in new form lucky to put out 225hp).
I want to swap this engine out with the GM Performance 350 H.O. (330hp / 380ft. lbs torque) However I want to retain the fuel injection, but on the other hand don't want to spend a fortune on a TPI or MPI setup.
My plan was to buy the H.O. engine, Performer intake, use TurboCity adapter and mount Holley's 670 TBI unit (Jegs P/N 510-502-6) which has 65lb injectors (as I was told by Holley), and then either have my chip custom burnt (locally) or buy one off the net...oh yeah and of course a new fuel pump and adj. fuel pressure regulator.
Questions:
Will I run into any trouble swapping over all my accessories, etc. between these two engines? I read in one post that there is some trouble using the old stock flexplate / flywheel?
Can I use my stock balancer / dampener?
Will the engine even run with the stock computer / chip programming? (so I can drive it to be reprogrammed if need be)
Is the 670 with 65lb injectors enough to feed this setup?
Will I need any new / different sensors?
Do the stock manifolds bolt up? I'll probably buy new shorty headers anyhow, but was curious if the Vortec's have a different pattern on the exhaust.
Thank you greatly in advance!
Last edited by BIGJ; Jul 7, 2003 at 10:23 AM.
Supreme Member
Joined: Jul 1999
Posts: 18,457
Likes: 16
From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
Everything will bolt up. Your plan is reasonably sound.
Accessory & exhaust bolt holes are the same.
That motor uses the same (1-piece) flywheel / flex plate as the 92.
You will almost certainly need some chip programming.
Your existing fuel pump is probably adequate; of course who knows how worn out it is or whatever, but there's no need to get some racing one or something. If you're worried about it, just get a new AC/Delco one.
Accessory & exhaust bolt holes are the same.
That motor uses the same (1-piece) flywheel / flex plate as the 92.
You will almost certainly need some chip programming.
Your existing fuel pump is probably adequate; of course who knows how worn out it is or whatever, but there's no need to get some racing one or something. If you're worried about it, just get a new AC/Delco one.
Thread Starter
Junior Member
Joined: Jul 2003
Posts: 2
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Well after 170k miles I think it's time for a new pump 
I wasn't going to get anything fancy. TurboCity.com sells a in-tank replacement that'll swap out without modification and push up to 28psi if need be...all for $139 not bad IMO.
I wasn't going to get anything fancy. TurboCity.com sells a in-tank replacement that'll swap out without modification and push up to 28psi if need be...all for $139 not bad IMO.
Last edited by BIGJ; Jul 7, 2003 at 11:51 AM.
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