Does anyone know what V6's came with forged pistons (3.1) in particular as I am building a twin turbo setup for my v6 and can't find solid info on it! Don't want to chang the pistons if I don't have to....Thanks!
Also will have pics soon on the one-off headers/turbo mount I'm building...

 

How many miles are on it. Ive heard that if you have a lot of miles its better to change them out...especially if youre running twins. I would change them just to be safe. Just my .

 

89k

 

No OEM 660s were equipped with forged pistons. They are ALL cast.

 

Should I use the fact. shaped pistons or go for dished for lower compression?

 

a lower compression would be the better choice, you can run more boost

 

Then could I use closer-ratio rockers to get more lift - with dished piston I mean..?

 

if you get your came made for the setup, you shouldn't need higher ratio rockers

 

Rockers are easier to install, and if looking for more lift, not duration...it's the way to go

 

Theis myth of low static compression needed for forced induction meeds to be stopped.

A higher compression enegin is more efficiant, revs quicker, making it nicer to drive, oh and it would also spool the turbo quicker.

From personal experiance I will build a higher SCR engine over a lower one, even when boost is concerned.
I have an 8.9:1 SCR engine in my Jimmy now with a turbo, if or when I put it back together, I will be using thinner head gaskets to bump the SCR to 9.3:1. If I really wanted to, I'd get new pistons to bump it to 9.6:1, but I already have the thinner head gaskstes.

 

More lift does not always mean more flow, sometimes more duration is what is needed.

 

More lift does not always mean more flow, sometimes more duration will be leaps and bounds more than increased ratio rockers.

 

Six_Shooter,
Have you done a cam swap with the motor in the car? The reason I'm going for forced induction is because I don't have the space to pull the motor in my garage now, otherwise I'd go with a V8, not to mention I like the idea of pulling away form a V8 with a 6. Thanx for the info on compression. When I do finally put forged pistons in, my plan is to have the heads worked @ Avalon Racing here in FL. First things first though, I'm ordering a turbo unit now and am building/designing some one-off headers for the 3.1. Have you dealt with a twin turbo set up before?