I have heard it recommended "if using greater than or equal to 11:1 compression ratio pistons to use race fuels or additives". Has this proven to be correct or only under race conditions? How much power gain will I be missing out on if I use a 10.5:1 piston as opposed to a 11:1 or 12:1? If anyone is interested it will be getting a Carrillo Rod and a Hot Cams stage 1 cam. I'm staying with stock bore. Any other thoughts or ideas would be appreciated.