i know how much you value my input ( ), so i urge you to keep that quench as tight as possible! i've built several hot street engines with compression ratios close to 11:1, with very good results, as long as the quench is super tight. they've all been between .035 and .039. my personal mill started at .055, and had some issues in hot weather, that were completely ameliorated when i brought it to zero deck. i am the quench nazi because of this experience.