1.550 Dual Valve Springs - (16) Valve Spring - 1200 Series Circle Track - Dual Spring - 550 lb/in Spring Rate - 1.150 in Coil Bind - 1.550 in OD - Set of 16

1.550 Dual Valve Springs - (16) Valve Spring - 1200 Series - Dual Spring - 644 lb/in Spring Rate - 1.150 in Coil Bind - 1.550 in OD - Drag Race - Set of 16

1.550 Dual Valve Springs - (16) Valve Spring - 1200 Series Circle Track - Dual Spring / Damper - 540 lb/in Spring Rate - 1.180 in Coil Bind - 1.550 in OD - Set of 16

1.550 Dual Valve Springs (16) Valve Spring - 1300 Series Circle Track - Dual Spring - 550 lb/in Spring Rate - 1.150 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 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