JIMS Valve Spring Kit Evolution Big Twin 1356

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, .600″ spring sets are 1.460″ OD and have a pressure of 125 lb. when closed and 275 lb. at .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 U.S.A.