My pistons are SRP part # 212134 with a 29cc dome with 115cc Brodix Racerite heads that give me a static compression ratio of 10.5 to 1. This works very well with the Crower solid roller part # 01475. If you are considering a combo like mine do yourself a favor and step up to a Brodix BB2 in a oval port configuration. These heads have a taller valve cover wall that helps oil return. Any other questions just pm me