3.1 Questions

[3.1cutlass]

So i am going to get my hands on a free 3.1. I have a few questions.
1. Can I use 3500 heads, UIM, and LIM on the 3.1 block?
2. I have a comp 260 grind cam. Would there be any issue? I plan to upgrade the springs and rockers.
3. On that note what is a good upgrade over the stock 3500 springs and rockers?

[Superdave]

1. No, the combustion chamber is too large
2. No...
3. LS6 or LS1 springs should work fine for the Comp 260 cam

[3.1cutlass]

Ok now that i know about the heads. Could i use the 3400 heads with a 3500 lim? i know the 3500 uim works with the 3400 but not sure about the lim.

[3.1cutlass]

Also what head gaskets would i use with the 3400 heads?

[Superdave]

no, the 3500 LIM is alot different then the 3400...


you'd have to use the 3400 heads and LIM and then 3500 UIM for a good combo.

you'd use the 3.1 headgaskets

[3.1cutlass]

thanks i am sure i will have a million questions when this is over

[3.1cutlass]

Ok so i am trying to put together a parts list. Here is what i have so far.
3500 Uim and TB
3400 LIM and Heads
3.1 head gaskets
What else?
I assume i will need custom length pushrods?

[1meanz]

yes youll need coustom pushrods. youll need a different tb cable when going from 3.1 to 3400. and probably the hard heater core hose (goes from water pump to under tb) from a newer car. (got mine from a 95 lumina with no tb heater) btw, tell me how the 260 grind is. considering this for one of my future mods

[3100 MPFI]

the 3500 does not have a normal throttle body that you will want to use. The 3500 is drive by wire. It is an electronic throttle body. Ben sells an adapter to use the normal 3100/3400 throttle bodies, or you can also buy a larger 62mm or 65mm throttle body from him.

You will need a 3100 throttle cable from a w-body.

[3.1cutlass]

thanks taylor