The stock pistons should work with the correct clearance. It is unknow if your stock pistons will provide the correct clearance with the cylinders. You might have to send the cylinders and pistons to millennium coating (or LN engineering ) to have them recoated and honed to the correct size if you wanted to use your stock pistons. You might be better off if the clearance is not correct to have JE or CP make pistons the correct size for the cylinders. FYI the new P&C sets from Mahle no longer use biral cylinders and now use nicasil coated aluminum cylinders.
john
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