Sorry guys, I told you wrong, they are Speed Pro pistons. I found them in summit STL-H618CP40. The cam is advanced 4 degrees. As far as squish figuring, I didn't figure nothing, just put it together. I should have known somthing was up when I had to rebuild the starter 5 times before I ever got it started the first time............good thing I primed it good before hand. I'm just wondering if I'm trying to run too much on pump gas?

Thanks, Kodiak