Butler Performance Inc. - Pontiac Cast Iron Cylinder Heads

BP ports more Pontiac cylinder heads than anyone in the world. After years of extensive R&D both on the flow bench and on our track, we have developed some of the best performing round port and D-port cast iron Pontiac cylinder heads ever. These heads can be ported for optimum performance on a 450 HP street engine or a 700+ HP racing engine, and everything in between. We have ported D-Port heads that run low tens in 3,700 lbs. stock suspension street GTO's to heads that run 8.50's in a 2,400 lbs. bracket car. We also specialize in porting RAII, RAIV, H.O. and S.D. round port heads.