What is the difference between an 1989 350 5.7L and a 1996 350 5.7L vortec is the heads,block or just the intake with fuel injection?

Brian N Williamson

Asked by Nov 19, 2015 at 11:28 PM about the 1996 GMC Sierra 1500 C1500 SL Extended Cab SB

Question type: Maintenance & Repair

I have a 1996 gmc Sierra  with a 305 5.0L vortec engine I want to rebuild it and
get more horsepower not alot more just for it to sound like it does will be ok.
I have an recently rebuilt 1989 350 5.7L can I take parts from it to put on the
other motor?  I'm trying to sell the other which would save my problem.

1 Answer


Big differences, The hole top of the engine is redesigned from your standard 350. Vortec fuel delivery system on that one is a Port fuel injection with a different head design that is of a high flow head compared to earlier years. The Vortec motor comes with a roller cam set-up so the block is a little different than earlier years as there is bolt holes in the valley for the push-rod guide, other wise the same block. You could take a Vortec set-up and put on a earlier block, but would have to use a different push-rod guide set up. Your question is confusing to me as it sounds like you want to rebuild the Vortec motor? I think I get it and the answer is NO, because of the ecm set-up in the 96". You need the Vortec set-up for it to run in your vehicle. Realistically you can do anything but requires a lot of work.

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