Valve Springs - HR Series (16) Valve Spring - Hot Rod Series - Dual Spring - 391 lb/in Spring Rate - 1.050 in Coil Bind - 1.459 in OD - Set of 16

Valve Springs - HR Series (16) Valve Spring - Hot Rod Series - Single Spring / Damper - 376 lb/in Spring Rate - 1.115 in Coil Bind - 1.500 in OD - AMC V8 / Big Block Chevy - Set of 16

Valve Springs - HR Series (16) Valve Spring - Hot Rod Series - Dual Spring - 392 lb/in Spring Rate - 1.020 in Coil Bind - 1.304 in OD - GM LS-Series - Set of 16

Valve Springs - HR Series (16) Valve Spring - Hot Rod Series - Dual Spring / Damper - 492 lb/in Spring Rate - 1.130 in Coil Bind - 1.540 in OD - Set of 16

Valve Springs - HR Series (16) Valve Spring - Hot Rod Series - Dual Spring - 417 lb/in Spring Rate - 0.910 in Coil Bind - 1.465 in OD - Set of 16

1.304 Dual Valve Springs - RPM Series (16) Valve Spring - RPM Series - Dual Spring - 392 lb/in Spring Rate - 1.000 in Coil Bind - 1.304 in OD - GM LS-Series - Set of 16