Need Help in Texas (engine is dying) (Page 2/2)
Vintage-Nut SEP 08, 01:59 PM
Awesome short block link fierofool!

So yes Forrest, you have hope by knowing options from merely fixing the bottom end knock or going 'big'!

The thrill can be addictive and encompasses several factors including your budget and time.

Hmm, I predict a new tech thread from Forres in the future.....
Forrest SEP 11, 08:57 PM
So this engine from a lumina....a 3100 is a bolt in....just need to replace the heads and intake from my old engine?

[This message has been edited by Forrest (edited 09-11-2023).]

phonedawgz SEP 13, 01:22 AM
Nope. The 60 deg V6 family of GM engines is a little confusing. The Fiero 2.8 IRON HEAD engine had a few other iron head siblings. The 3.4, 3.1 and 2.8. These are different from the aluminum head engines. The 3100 (your picture) and the 3400s are aluminum head engines. The bell housing and motor mounts are the same, but if you bolted the iron heads on an aluminum head engine, you will have compression ratio issues.

You could use a 3100 or 3400, along with the computer/wiring for that engine and it would work in the Fiero. If you were doing an automatic swap, you would also want to use the automatic from the donor car. You would have to rewire the harness to fit the Fiero.

But back to the 3.1 iron head swap that you want to do. This is the 3.1 engine you are looking for. It's a bit older than the 3100.

[This message has been edited by phonedawgz (edited 09-13-2023).]