Scat's hi-tech, fatigue resistant 9000 material cast steel cranks have near forged steel endurance at a value price! A perfect way to increase cubic inches on mild to moderate street or race engines. For 2-piece rear main blocks. Aero-wing counterweights increase horsepower by reducing windage. Straight shot oil holes. Lightening holes in all rod throws. Precision ground and micro polished. Externally balanced.