I'm wondering something. What do you guys think?
If i order a wiseco high compression piston for my 300ex what oversize should i get? .020 .040 .060? or what?
As far as i know it's never been rebuilt, but since i bought it used i really have no way of knowing for sure.

 

just go .020 over since its your first rebuild.

You aren't going to gain anything by small over bores like that