Isky Cams Valve Springs (Blue-Orange/Yellow) - Dual w/ Damper (Hydraulic Cams) - 1.005"-1.430" O.D., .730"-1.070" I.D. H764001XS It should be replaced when

It should be replaced when replacing the tailshaft seal or when a driveshaft failure has occurred

4 Piston Caliper

2009-2011 Chevrolet Silverado 3500 HD

They have 20% more exhaust flow than cast iron Vortec heads

Tapered roller wheel bearings and bearing races are direct replacements for many popular applications

Isky Cams Valve Springs (Blue-Orange/Yellow) - Dual w/ Damper (Hydraulic Cams) - 1.005"-1.430" O.D., .730"-1.070" I.D. H764001XS It should be replaced whenIsky Valve Springs are world famous for their reliability and long life. 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, Isky maintains a continuous engine