I was given a set of 2322 trw pistons that have been milled to flat tops. I see in a speed pro catalog I have that these are shown both as doomed 12.5 to1 and also as flat tops. My ? Is what thickness would be safe after cutting them. I'm getting .200 on these pistons and when I compare other pistons in my possession the thinest I found were .300. What is a safe # for n.a. use (no nitrous)? Even some old stockers I have are .300 or more. Thanks