I haven't put them in yet, maybe I won't after reading your posts. I don't really want to run into problems. There is a station close to me that sells "Cam 2" I think that is 107oct. When I check my compression, I kept one plug in, with the compression testor in the empty cyl, and kicked until the testor maxed out(about 8-10kicks). The way the dude on ebay talked, I could just run 93oct and increase my midrange power substantially.