Performance Valvetrain

PAC Racing Springs PAC-S135-16 valve spring retainers. Features inside design, 0.060 in thick, 1.270 in OD, 0.570 in ID, 0.680 in spring ID, chromoly, set of 16, ideal for performance builds with RPM dual springs.

PAC Racing Springs PAC-S113-16 valve spring retainers. Features inside design, 0.060 in thick, 1.450 in OD, 0.630 in ID, 0.980 in spring ID, chromoly, set of 16, ideal for performance builds.

PAC Racing Springs PAC-R317-16 valve spring retainers. Features 300 Series, 10-degree lock angle, 0.990 in/0.700 in OD steps, 1.374 in OD, dual spring compatible, chromoly, set of 16, ideal for performance builds.

PAC Racing Springs PAC-R333-16 valve spring retainers. Features 300 Series, 7-degree lock angle, 0.640 in OD step, beehive spring compatible, chromoly, set of 16, ideal for performance builds.

PAC Racing Springs PAC-R387-16 valve spring retainers. Features 300 Series, 10-degree lock angle, 1.122 in/0.735 in OD steps, 1.450 in OD, dual spring compatible, chromoly, set of 16, ideal for performance builds.

PAC Racing Springs PAC-S119-16 valve spring retainers. Features inside design, 0.060 in thick, 1.550 in OD, 0.575 in ID, 0.800 in spring ID, chromoly, set of 16, ideal for performance builds.

PAC Racing Springs PAC-S129-16 valve spring retainers. Features inside design, 0.060 in thick, 1.270 in OD, 0.520 in ID, 0.680 in spring ID, chromoly, set of 16, ideal for performance builds.

PAC Racing Springs PAC-L8143-16 valve locks. Features 8-degree lock angle, 8 mm valve stem, -0.050 height, steel with black oxide finish, radius groove, set of 16, ideal for performance builds.

PAC Racing Springs PAC-L8146-16 valve locks. Features 7-degree lock angle, 11/32 in valve stem, standard height, steel with black oxide finish, square groove, set of 16, ideal for performance builds.

PAC Racing Springs PAC-S133-16 valve spring retainers. Features inside design, 0.030 in thick, 1.650 in OD, 0.570 in ID, 0.630 in spring ID, chromoly, set of 16, ideal for performance builds.

PAC Racing Springs PAC-1212X-16 valve springs. Features RPM Series single spring design, 380 lb/in rate, 1.180 in coil bind, 1.355 in OD, fits Small Block Chevy GM 604 crate engine, set of 16, ideal for performance builds.

PAC Racing Springs PAC-1258-16 valve springs. Features 1200 Series Drag Race triple spring design, 688 lb/in rate, 1.130 in coil bind, 1.645 in OD, set of 16, ideal for drag racing applications.