CRF 450 Cylinder Heads

STAGE 1:       Port & Flow tested designed to utilize stock, valves and springs.
                       Increases max. torque and horsepower throughout the power range.
                       Should be used with DRS CRF 450 pipe.

STAGE 2:       Port and flow tested using special bronze intake guides, 38/30 valves.
                       High lift valve spring, kit with titanium retainers.
                       Should be used with DRS CRF 450 pipe.

STAGE 3:       Special project heads can be configured to your specification.