1.290 Dual Valve Springs 16pk Valve Spring - Dual Spring - 370 lb/in Spring Rate - 1.200 in Coil Bind - 1.290 in OD - Set of 16

1.570 Dual Valve Spring Set w/Damper (16pk) Valve Spring - Max-Life - Dual Spring / Samper - 644 lb/in Spring Rate - 1.150 in Coil Bind - 1.570 in OD - Set of 16

1.274 Drag Race Dual Valve Spring Set 16pk Valve Spring - 1300 Series Drag Race - 673 lb/in Spring Rate - 0.971 in Coil Bind - 1.274 in OD - Set of 16

1.200 Dual Valve Spring Retainers 16pk Valve Spring Retainer - 600 Series - 8 Degree - 0.775 in OD Step - 1.200 in OD Dual Spring - Steel - Set of 16

Ti Dual Valve Spring Retainer Set 10-Deg 16pk Valve Spring Retainer - 500 Series - 10 Degree - 1.140 in / 0.815 in OD Steps - 1.475 in OD Dual Spring - Titanium - Set of 16