Found some JE/SRP Pistons, .020 over,
guy want a good price for them, but in a DOHC ZC this is going to give me 8.1:1 CR. I want to keep my 9.5:1. How much of a difference will this make. I know its safe detenation wise, but I'm wanting 320whp on a .60/.63 T3.

Getting Delta Regrinds and a Custom IM.

EDIT: Just double checked and with the bore I get a bit over 8.2:1

 

What about maybe shaving the head a little and running a thin headgasket to bump it a little more?

 

yea..i'm running wisecos that will put a lil over 8.3:1 because of the deck and mill....i'm gonna be running about 25psi on a huge holset turbo... i'd say you need a bigger snail and more boost

 

Well by search by part numbers and finding the dome height, 7.9:1 CR is what I would yeild. Too low. Yes shaving the head is possible, but for the price of machining of the overbore and shaving the head, I could buy the right pistons.

Plus with the DOHC ZC good luck finding a thinner HG!!!
I'm gonna run 18-21 psi. Just ordered my Eagle Rods.
Big Garrets live in my backyard!! My Bro-In-Law has them all the time, if a bigger housing is required, I would have no pronb finding one.

 

endyn roller wave ZC pistons....done.

 

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There are a few other companies that make ZC Sepcifics also for a better price.

Or A JE/SRP D16A6 pstion with a 5.7cc dome gives me 9.2:1 or so.

 

raceeng.com had Wiseco 9:1 ZC pistons..you can see it in the list of there own pistons. for D16a1(ZC)

 

Ya I know. This guy just wanted 250 Shipped. For BRand new pistons that pretty good. but 7.95:1 is too low. Gonna have to pay a bit more to get the #'s I want

 

8.0 is fine compression, i would run it
itll be hella easy to tune and u can run 20 psi no problems or blown hgs

 

Bumblezc, I will be using D16A6 SRP's in my DOHC ZC. I'm looking at like 8.3:1 and if I get the blang bling HKS HG it'll put me in the low 9's.