1.240 Dual Valve Springs Valve Spring - Dual Spring - 320 lb/in Spring Rate - 1.020 Coil Bind - 0.915 / 1.240 in OD - Set of 16

Dual Valve Springs - 1.470 Valve Spring - Dual Spring - 399 lb/in Spring Rate - 1.080 in Coil Bind - 1.470 in OD - Set of 16

1.570 Dual Valve Springs 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

Dual Valve Springs - 1.540 Valve Spring - Dual Spring / Damper - 510 lb/in Spring Rate - 1.190 in Coil Bind - 1.540 in OD - Set of 16

Dual Valve Springs - 1.557 Valve Spring - Max Effort - Dual Spring / Damper - 471 lb/in Spring Rate - 1.150 in Coil Bind - 1.557 in OD - Set of 16

1.550 Dual Valve Spring Valve Spring - 1200 Series - Dual Spring - 540 lb/in Spring Rate - 1.180 in Coil Bind - 1.550 in OD - Circle Track Endurance - Each