Alright, I've decided to go with forged stock compression 11.5:1 pistons and use the Cometic headgasket.

I don't have 3 weeks to wait for custom pistons to be made, and I think 9:1 is too low for my application-- probably better suited to the turbo guys.

 

Why would you use aftermarket 11.5:1 pistons when you can use the stock OEM pistons (11.1:1, no sleeving)?

 

The factory pistons have inadequate lands for high boost. Slow down and do it right. Sleeve the block, use the 9.5:1 pistons and do it the way you really want it. I noticed very little going from factory 11.0:1 to 9.5:1 other than it starts easier due to less compression.

 

Do you consider 12psi (SC peak) to be high boost?

 

I HAD to sleeve my block because of the damage to the cylinders.

Does that change anything?

I can't find any pistons readily available that aren't either 11.5:1 or 9:1.

This is currently my only car... I mean I "could" go out and buy another car, but I just don't want to right now.

I can't afford another 3 week wait for custom pistons, as I've been without a car for 3 weeks already.

My options are limited to 9:1 with stock headgasket or 11.5:1 with cometic (dropping it to 9.8:1)...

The block is being sleeved either way.

EDIT: I'M AN IDIOT... I didn't realize that 11.5 is not the stock compression ratio... So now, I'm even more confused...

I guess running 11.5:1 pistons with a cometic headgasket is out of the question?

 

Were you able to find 9.5:1 pistons or did you have them made?

Do you think that say a JE or CP 9:1 piston is too low for my setup (Maxing out at 12psi)?

Thanks,
Matt

 

Matt slow down man.DO NOT buy a 11.5:1 Piston. That is .5 higher than the stock compression, you are going the wrong way man. You need to get a 9.0:1- 9.5:1 . Im sorry your car has been down buy its just part of the game. Do not half ass something because you are stressed on time. If you are still using a 87mm sleeve, and you are short on time, go back to the stock piston and put the car back together. If you want to do it right, go with a Low compression piston. The wait time on some 87mm 9:0 wiseco pistons is not that long.

 

Go with higher boost..not 12 psi if you can. If you want to do all this work and investment, do it how you want to do it. I just don't think 12 psi, and you want more later can cost you more going with pistons.

 

atoice are you 10psi on stock compression?whats your setup?

 

I am in the process of getting 9:1 pistons... I will run the stock headgasket.

I messed up and ordered the 11.5's without realizing that they aren't stock compression.

I really don't want to run much more than 12psi... My goal is to have a fast daily driveable car.

Thanks for all you guys' help... It is greatly appreciated.

-Matt