I know this is still kinda guessing, But when I had the engine built ir was made to be 10:1 compression. It was built once and spun a bearing so we had to rebuild it again. Then he said he got a differant gasket this time on the head gasket so it would raise the compression a little.

thanx guys for the replys, Ill have to go try and get a hold of this guy. Hopefully he remembers if i get ahold of him.