hi guys, im new to the site. Im helping a friend go thru his 1990 302. he went with an f cam and wants to mill the heads a little. my question is, he got a good deal on a stock rotating assy. with machined valve clearance pockets. the pistons look really clean as far as scuffing on the skirts & what not. what is the loosest acceptable piston to wall clearance we could run. i miced the pistons he's gonna use and set up a dial bore gauge to check the bores and theres .0055 -.006 total clearance between them. he's on a budget & dont want to bore & buy new pistons. we want to pass a ball hone to knock the glaze off the cylinders so the new rings will seat. the bores are clean of any scratches & round within .0005.,so i dont think we will have to hone much at all. also, the stock heads are port matched, could we safely mill .02 off them? like i said valve clearance should not be an issue. thanks guys.