But you said with a .020 gasket and the 53cc heads you would have 9.32. I think with the .039 you'd be dropping closer to the stock 8.5, or did I miss something?So then It should have 8.5:1. So If I use my 53cc heads and a .039 headgasket. It should be some where around 10.2:1. IS this safe to use with 93 octane??