TBI Question

[Georgeb]

I tried a search with no luck. The short story is I am looking at a 350 from a 91 truck and wondered if there are differences in the theottle body from 87 thru 91 or even up to 95? I hear the IAC, TPS and fuel pressure requred are different. Can someone tell me the differences thoughout the years and what can be adapted?

 

[89Suburban]

I tried a search with no luck. The short story is I am looking at a 350 from a 91 truck and wondered if there are differences in the theottle body from 87 thru 91 or even up to 95? I hear the IAC, TPS and fuel pressure requred are different. Can someone tell me the differences thoughout the years and what can be adapted?

I'm going out on a limb and say at least the 87 - 91 throttle bodies are the same.

 

[skysurfer]

Agree with 89S, and the only difference I know of within the GMT400 series is the '94-'95 bbc's used smaller (46 pph) injectors at higher (30 psi) pressure. I'm curious where @Georgeb read there might be different fuel pressure requirements within the sbc tbi years. Everything I've read says 9-13 psi.

 

[Georgeb]

Agree with 89S, and the only difference I know of within the GMT400 series is the '94-'95 bbc's used smaller (46 pph) injectors at higher (30 psi) pressure. I'm curious where @Georgeb read there might be different fuel pressure requirements within the sbc tbi years. Everything I've read says 9-13 psi.

I didn't read that there was different fuel pressures I had someone tell me that during some discussion about replacement engines for my 87 because I was looking at a 94 engine too. But the guy I was talking to may have been refering to a big block rather than a small block.

 

[BowTieJockey]

Just got done putting a 92 engine in an 87 and there are some differences such as the tps having a different connector and the alt and ac being on opposite sides. Oh and the temp sensor in the head of the newer trucks too it's there. Other than that they are pretty close.

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