1.539 Dual Valve Springs - (16) Valve Spring - 1200 Series - Dual Spring / Damper - 500 lb/in Spring Rate - 1.130 in Coil Bind - 1.539 in OD - Circle Track Endurance - Set of 16

Dual Valve Springs w/Damper - LS1 Valve Spring - SP-Series - Dual Spring / Damper - 360 lb/in Spring Rate - 1.060 in Coil Bind - 1.440 in OD - Set of 16

1.538 Dual Valve Springs w/Damper 16pk Valve Spring - Hot Rod Series - Dual Spring / Damper - 436 lb/in Spring Rate - 1.090 in Coil Bind - 1.538 in OD - Set of 16

1.550 Pro Valve Springs Dual w/Damper Valve Spring - Professional Series - Dual Spring / Damper - 458 lb/in Spring Rate - 1.180 in Coil Bind - 1.550 OD - Set of 16

1.525 Valve Single Valve Springs w/Damper (16) Valve Spring - Single Spring / Damper - 462 lb/in Spring Rate - 1.200 in Coil Bind - 1.525 in OD - Set of 16