Isky Cams 1.570 Valve Springs MGZR 128 GB (internal storage)

128 GB (internal storage)

Not compatible with 1976 Pontiac 400 blocks due to factory notches at the top of cylinders

400" spacer must be used behind crank timing gear

Available in MK-Kit w/ 24X Timing Set under MK54-337-24

75 in OD Tube

Isky Cams 1.570 Valve Springs MGZR 128 GB (internal storage)Product Description: Valve Spring RAD 9000 Dual Spring Damper 570 lb in Spring Rate 1. 130 in Coil Bind 1. 570 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