i was wondering what all i would have to change from a 85' 2.8 to a 92' 3.1(wiring harness, ecm, or anything). or if it would just swap right in.

 

Although this is an "engine swap", technically, those who frequent this forum don't tend to specialize in V6's.

At the risk that you've already posted there, I'll move this from "Swap" to "V6".

 

doh!!!!!!


, also read KED85's article on the 2.8~3.4 swap boggie & pretty much substitute 3.1 everytime you read 3.4.

 

You can build a 3.1L from a 2.8L block.

Remove 2.8 rotating assembly.
Insert 3.1 rotating assembly.

Enjoy the 'stroker' motor

 

thats what i'm doing with this new 2.8 i have, gotta love more torque

 

me too, but i'm gonna bore it .060" too and build a beast of a motor!

 

In the end, it comes down to this
Remove original vehicle engine
Put the two engines side by side.
Strip down, each engine or compare what is "the same".
Redress new donor engine
Slip back into original vehicle engine bay.
"Done".
Up grade injectors, by replacing into the "correct fitting" original design fuel rail.
In the end, the finished product should look exactly like what ya started with. Serious, that's the way to do this project.
No true engineering incvolved. Simple mix of the best parts reinsert new donor engine.

 

i couldn't have said it better myself, but just word to the wise for everyone, if you are gonna use the 3.1 crank, use the 3.1 pistons too