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

1.550 Dual Valve Springs (16) Valve Spring - 1300 Series Drag Race - Dual Spring - 1015 lb/in Spring Rate - 1.230 in Coil Bind - 1.550 in OD - Set of 16

1.550 Dual Valve Springs - (16) Valve Spring - 1200 Series - Dual Spring - 663 lb/in Spring Rate - 1.150 in Coil Bind - 1.550 in OD - Drag Race - Set of 16

1.550 Dual Valve Spring 1pk Valve Spring - 1300 Series - Dual Spring - 644 lb/in Spring Rate - 1.150 in Coil Bind - 1.550 in OD - Each

1.550 NexTek Dual Valve Springs Valve Spring - NexTek - Super Finish - Dual Spring - 618 lb/in Spring Rate - 1.150 in Coil Bind - 1.550 in OD - Set of 16