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

Dual Valve Springs - 1.437 Valve Spring - Dual Spring - 283 lb/in Spring Rate - 1.025 in Coil Bind - 1.437 in OD - Set of 16

1.550 Dual Valve Springs Valve Spring - Dual Spring / Damper - 508 lb/in Spring Rate - 1.080 in Coil Bind - 1.550 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