Isky Cams Endurance Plus„¢ Dual Valve Springs W, Damper (16) - 1.530" O.D. - 420 lbs., "Rate - 1.160" Coil Bind EFI Engine Lift Plate Electric fan supplies optimum airflow

Electric fan supplies optimum airflow

Billet Style

1968-1970 Ford Falcon Base CID 302 Naturally Aspirated GAS

Chevy Corvette 1968-1976

2008-2010 GMC W4500 Forward

Isky Cams Endurance Plus„¢ Dual Valve Springs W, Damper (16) - 1.530" O.D. - 420 lbs., "Rate - 1.160" Coil Bind EFI Engine Lift Plate Electric fan supplies optimum airflowThe Endurance Plus series of valve springs utilizes a specially processed Tool Room Material outer spring for increased endurance reliability beyond the "SP" series. Endurance Plus springs are designed for late models, modifieds, etc. , and are Spintron Test Proven up to 8400 rpm for 850 racing miles. As the world's largest racing, performance, and economy cam manufacturer, Isky maintains a dynamometer testing program for constant improvement of