Manley 1.580 Diameter Valve Spring Cups - Spring O.D.: 1.580", Cup O.D.: 1.570", Cup I.D.: .570", Wall/Shlder Height: .140", Shlder Dia: .825" - (Set of 16) RS004C1513 40"Port Size: 1

40"Port Size: 1

High-temperature silicone heating pads externally preheat oil in wet sump oil pans

Works with both truck and car LT intake bolt patterns

Use when changing from a dry sump to a wet sump engine or when extra clearance is required

1977-1977 Buick Riviera

Manley 1.580 Diameter Valve Spring Cups - Spring O.D.: 1.580", Cup O.D.: 1.570", Cup I.D.: .570", Wall/Shlder Height: .140", Shlder Dia: .825" - (Set of 16) RS004C1513 40"Port Size: 1Manley Spring Cups offer superior performance and reliability and are the choice of many top engine builders. Manley Performance high performance and racing engine parts have been powering winners since 1966. Since our inception in March 1966, Manley Performance Products has been at the forefront of the high performance automotive industry. Founded by gearhead Hank Manley shortly after his graduation from Brown University, our journey began with a