I am runnig what came in the kit. The Mahle web site list these pistons CR with 58 cc heads as 9.5:1, 64cc is 8.8 and 70cc is 8.3.

I need to see what valve sizes they will support. Ford is running them with Z heads and 2.02's. Don't Vic Jr's ahve 2.05's?

I have P heads, with about a 60cc now, So a 58cc would be livable.