Thread: 87+intake on older heads

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Im in the process of buying a TPI setup off of a 90's 350. I know the heads are slightly, im almost sure that i can use these with older heads. I knowi have to like grind the bolt holes or something? What all do i have to do? Thanks in advance!

--Steve

From about 86/87 on gm took the 4 center bolts on the manifold and tilted them up for better access. I would buy the heads as well, You will have to elonggate the hole to mach the heads and then you may not get a very good seal and the possability of oil leaking from the bolts. If you dont want to buy the heads you can look for a older TPI setup that will fit the older heads. Are you getting the computer, wiring harness and all the sensors as well.

i cant buy a older one i already have this one. i have everything for a complete swap. i have heard somewhere where you can make this work, i just cant find it, i was thinking maybe you guys could help me!!

--Steve

Manifold bolt pattern didn't change until '96. In '96 Chevrolet went to the 4-bolt pattern on Vortec heads and intakes. The change in 87 was one-piece rear seal on the block. The only difference in heads from pre-'96 till '69 is center bolt valve covers.

i dont think thats correct. i kno the bolt angles/depth changed. any ideas about gettin around that?

Is it an LT 1 setup? If it is, check out this link: www.lt1intake.com

In '87 later heads, the center intake bolts are at a 72* angle. You can use a drill bit to oblong the center holes to fit a standard head pattern.