can I install a 1990 350 gmc truck motor in 1996 gmc pickup w/ a bad 350 vortec(rod Knock)?

Asked by Jul 07, 2010 at 01:20 AM about the 1996 Chevrolet C/K 1500

Question type: Car Customization

I have a 1996 gmc pickup with a 350 vortec motor.The motor runs, but has a rod knock.
I have a newly rebuilt 1990 chevy 350 out of a chevy truck that runs great. Will I be able to use the 1990 motor in this truck ? If so, what will I have to do to make it work properly?
It would be great if all I had to do was put the vortec intake and or vortec heads on the 1990 motor and be done with it.
HELP!!!!!!

7 Answers

125

It's been my understanding that Vortec heads won't fit other SBC styles... I'd install whole motor into the truck.It would bolt up to the tranny easily The computer would prolly need to be switched out for the one from the 1990 though.

1 of 1 people found this helpful.
35

the heads n intake should bolt up on the 1990 block, ive heard of people doing it

55

Yes the heads and intake are different but all you have to do is switch then from the 96 to the 90 and then you dont have to change anything else.

2 of 2 people found this helpful.
25

it will just bolt right up. just take the hardware off the vortec and put it on the 90 block. you should be good with that. and if you have any questions check out the fullsizechevy forum

2 of 2 people found this helpful.
70

Can I do the reverse? I had some head gasket work done on my 1996 Yukon 350 vortec, found the heads were no good and put heads from a 1994 350 on it. Running rough and stalling at idle. Could it be the heads are not compatible?

7 of 7 people found this helpful.
20

So you are telling me. I could take the heads and intake off the 1996 vortec motor. And take the heads and intake off of my 1993 350 motor. And put the vortec heads and intake on my good 1993 350. And that would make the 1993 350 motor with the vortec heads and intake on it. Work in my 1996 truck. Right?

2 of 2 people found this helpful.

Heads off a vortec up to 98 will fit a tbi as long as they are 350 ci. Tbi (trottle body injection) can still be used but you either need an aftermarket intake for the swap intended or you need to drill the mounting holes in the tbi intake. One bolts straight in the other is diagnal. Cant remember which is which. The vortec intake has different coolant line setup and uses spider injection, therefore, cpu would need swapped. You will not see a significant hp gain with heads alone. The cam would need changed to vortec also. Open up airflow (intake/exhaust) for max gain.

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