Jim’s Valve Spring Set. 600in for 1984-2004 Harley Davidson Evo Big Twins

Jim’s Machining 1356 Valve Spring Set. 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. 500″ lift; installed height should be […]