Provides concentric water flow, thus preventing hot spots. Sealed to the cylinder with O-rings to create a metal to metal contact, providing even engine temperatures. The improved combustion chamber pocket and squish area, increases horsepower and torque. Additionally, the head allows girdling through the cylinder to the crankcase, providing a much stronger and durable package.
Girdle kit is optional.
Improved torque and horsepower. Big bore head for 86mm to 87.5mm bore. For use with trail mod engines on 92 octane. Big bore head for 108 octane race gas on trail or race ported engines.