Piston rings for a 221 c.i ?

[flatjack9]

Originally Posted by 36tudordeluxe

Okay, understood now. I measured piston across the wrist pin hole and came up with a dia. of 3.1215" and cylinder bore of 3.1250". I think this is a little loose based on a chart I'm referring to but should be okay, right? BTW, this is a 221 at .060 over. UPDATE: Think my measurements may be bogus, am getting something different every time I remeasure the bore, more often than not I get a bore dia. smaller than the piston!

You should be measuring the piston diameter at 90* from the pin bore.