I am hearing some conflicting stories on what pistons to go with in my 2.0l
9.5:1 or the 10:1 only going to be running 91 octane gas. Some people are saying 10:1 not good others have no problems. So if you are running these pistons I need your opinions and what setup you are running.Thanks Chris.

Reasons for changing pistons: More power and want to run nitrous, don't want to run the 2.5" pulley anymore.

 

first off i guess would be the question of why are you changing them, and what are you looking to achieve?

 

^ Yes, that would be the most important question.

 

you goin bigger sc or tc

 

Or maybe hes going with a 2.5, and just wants to be on the safe side.

 

I think he said he was done with the 2.5 I'm also needed to know about these pistons!

 

Go with a 2.9" pulley, and you can run 10.0:1 pistons. GM does it in the 300hp LSJ book. You will be fine, get them Ceramic coated up top and it will help eliminate the possibility of knock.

 

Go with custom 8:1 pistons and just stay with the 2.5 and add N20.