Isky Cams High Endurance Dual Valve Springs (Yellow) - 1.560" O.D., .740" I.D. BLOWER-FILTER-3-AC-R Some long tube headers require

Some long tube headers require modification

70-100 Percent

1/4 lb Increments

2003-2006 Chevrolet Silverado 1500

Isky Cams High Endurance Dual Valve Springs (Yellow) - 1.560" O.D., .740" I.D. BLOWER-FILTER-3-AC-R Some long tube headers requireTest proven for 700 racing miles, High Endurance Valve Springs are wound from "Super Clean" chrome silicone wire. Perfect for Late Models, Modifieds and other applicatons running up to 8000 RPM. 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