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Isky Cams Max-Life Triple Valve Spring - 725 lb/in - 1.130 in Coil Bind - 1.660 in OD (Set of 16) LY23171 Truck or SUV sound andProduct Description: Valve Spring Max Life Tripe Spring 725 lb in 1. 130 in Coil Bind 1. 660 in OD Set of 16 As the world's largest racing, performance, and economy cam manufacturer, Isky maintains a dynamometer testing program for constant improvement of camshaft and valve train design. These tests are conducted daily in Isky's new enlarged dyno facility. To properly evaluate and prove the efficiency of Isky racing cams and valve train components,