If you use high compression a6 pistons (11.0:1) in a dohc zc will they work without any problems? I am thinking of buying high compression pistons for an a6 to put in my zc because the a6 pistons are way cheaper.
They will physically work, but it doesn't mean you will get 11:1 when they're in a ZC. Calculating compression ratios isn't my strong suite, but I'd guess it would be closer to 10:1.
I understand the drive to save money but make sure what you're buying will do the job, otherwise you're not saving a dime.