R & D’s Pro-Series heads reliably increase engine compression and power. Combustion chambers are precision-machined providing exact chamber volume. Watertight volume is increased for improved cooling. Head gasket is replaced with more reliable high-temp o-rings. Head Body features a one-piece design..
R & D’s Pro-Series heads reliably increase engine compression and power. Combustion chambers are precision-machined providing exact chamber volume. Watertight volume is increased for improved cooling. Head gasket is replaced with more reliable high-temp o-rings. Head Body features a one-piece design..