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

1.514 Dual Valve Springs Valve Spring - Dual Spring - 360 lb/in Spring Rate - 1.150 in Coil Bind - 1.514 in OD - Set of 16

Dual Valve Springs - 1.514 Valve Spring - Dual Spring / Damper - 348 lb/in Spring Rate - 1.150 in Coil Bind - 1.514 in OD - Set of 16

Dual Valve Springs - 1.500 Valve Spring - Dual Spring - 413 lb/in Spring Rate - 1.100 in Coil Bind - 1.500 in OD - Set of 16

1.580 Dual Valve Springs Valve Spring - NexTek - Dual Spring - 535 lb/in Spring Rate - 1.170 in Coil Bind - 1.580 in OD - Set of 16