1.660 Spring Cups

The 1.660 Spring Cups from MANLEY are precision-engineered valve spring components specifically designed for high-performance and racing engines where spring pressure stability is crucial. These spring cups act as the seating interface between the valve spring and the cylinder head, effectively transmitting spring load directly to the valve train. They are essential for anyone building a competition engine or maintaining performance machinery.

The 1.660-inch bore diameter is designed to accommodate springs within that range while maintaining proper seating geometry. MANLEY's manufacturing standards ensure concentricity and a high-quality surface finish that helps prevent spring binding and premature wear. The cups are made from hardened steel to withstand cyclic loading from continuous valve actuation at high RPM.

Engine builders, race shops, and powersports technicians rely on MANLEY spring cups for both OEM replacement and performance rebuilds across various platforms. Proper fitment of these spring cups is essential during any valve train service, as improper sizing can compromise spring rates and overall engine performance.