pitzzilla

I have a 85 305 TPI that I would like to put in my 4x4 what mods can be done to the engine to get as much torque out of it. I'll be using it for towing pertty much

brutalform

leave it like it is

Oshdog

Even if you got the /85 TPI for free, I think you would still be better off to sell the 305 and buy a 350.

Swapping a motor into a 4X4 is a bit of work, and converting to TPI can get expensive. So I also suggest that you not use the /85 type Tune Port Injection. Use /86 or up, or convert your /85 system to a newer system. I don’t even think you can buy an aftermarket wiring harness for the 85 type.

If money is not an issue just sell what you got and get 350 TPI out of a latter model if you’re stuck on having a TPI.
If money is an issue, just get a good 350 with a 4bbl carb, and swap in some 373s or 411.

pitzzilla

I have a 350 I can top it off as for wiring painless sell a harness that would work up graded to 86 just looking for impovements in tourqe. I owned a 2001 4x4 but had trouble pulling the trailer loaded since its cheaper to build my own FI engine the way I want and power that I want and Ihave most of the part I'll try it inmy 85. If carb is the way to go what mod need to be done to get a happy amount of toruqe. I can go either way would like tpi

JeffW

do you know which 305 you have?

in 85 gm gave us a 305 LB9 tpi that has 215 hp and 275 tq

86+ iroc. 190 hp 245 tq 87 l89 would be 225hp 330 tq

in the 90's it satrted to jump a bit more L89 245 hp 300+tq thats if you can find a l89 it would have to run rpo codes to be sure.

so unless you can find a 90's plus i would just stick it as you have it and gear the truck for pulling. gear makes a bigger diffrence than hp.

jeff

pitzzilla

I dont know how would I find out if it is a LB9 or?

TKOPerformance

The Edelbrock Performer package makes a nice addition to a 4X4 Chevy truck. One of the best improvements though: HEADERS.