Isky Cams Dual Valve Springs - 1.570" BR20033 The center-mounted adjuster uses both

The center-mounted adjuster uses both left and right hand threads

Chevrolet Mark-IV Big Block V8

Chassis Engineering wheel tubs are 23" wide and 40" long

Withstands 475F direct continuous heat

Isky Cams Dual Valve Springs - 1.570" BR20033 The center-mounted adjuster uses bothProduct Description: Valve Spring RAD 9000 Series Dual Spring w Damper 560 lb in Spring Rate 1. 100 in Coil Bind 1. 570 in OD Universal 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