Valve Spring Kit – Evolution – Big Twin

Incorporate an interference double-spring design with damper to control harmonics; Engineered for maximum performance in severe applications such as high compression and big-inch street motors; 0.600″ spring sets are 1.460″ OD and have a pressure of 125 lb. when closed and 275 lb. at 0.500″ lift; installed height should be 1.800″; coil bind occurs at 1.150″; Sold in a set of four springs (enough for one engine); Made in the USA