1.5:1 ratio "high-lift" forged rocker set. The benefit of higher lift with certain cams is well documented. The improved rocker ratio speeds the opening of the valve for even greater air-fuel mixture to reach the chamber. Supplied as a complete assembly (less springs or spacers) with heavy-duty rocker shaft, steel pedestals and adjustment hardware. Verify compatibility with your cam supplier and check for valve-to-piston clearance and valve spring binding with high-lift cams.