305 Pistons

[tomcat2821]

I looked at the Pistons ther eis a stamp ontop 0.25 are these standard pistons also the gasket kit I have is a D&K not for sure if this is for STD or OS I did take the old head gasted and and the new one I didnt take it out of the pack but laid it over the new one they look they are the same size.

[LOUD MOUSE]

Your pistons are 1st oversize and a stock/standard size head gasket will work. .........