Performance Valvetrain

PAC Racing Springs PAC-R511-16 valve spring retainers. Features 500 Series, 7-degree lock angle, 0.640 in OD step, beehive spring compatible, titanium, fits GM LS-Series, set of 16, ideal for performance builds.

PAC Racing Springs PAC-S111-16 valve spring retainers. Features inside design, 0.060 in thick, 1.270 in OD, 0.570 in ID, 0.870 in spring ID, chromoly, set of 16, ideal for performance builds.

PAC Racing Springs PAC-KS15 valve spring kit. Features dual spring, 370 lb/in rate, 1.010 in coil bind, 1.290 in OD, includes chromoly retainer, locks, Viton seal, steel seat, fits GM LS-Series, ideal for performance builds.

PAC Racing Springs PAC-R310-16 valve spring retainers. Features 300 Series, 10-degree lock angle, 0.640 in OD step, beehive spring compatible, chromoly, set of 16, ideal for performance builds.

PAC Racing Springs PAC-S128-16 valve spring retainers. Features inside design, 0.060 in thick, 1.270 in OD, 0.520 in ID, 0.600 in spring ID, chromoly, set of 16, ideal for performance builds.

PAC Racing Springs PAC-R508-16 valve spring retainers. Features 500 Series, 10-degree lock angle, 1.040 in/0.715 in OD steps, dual spring compatible, titanium, set of 16, ideal for performance builds.

PAC Racing Springs PAC-L8065 valve lock. Features 10-degree lock angle, 5/16 in valve stem, -0.050 height, steel with black oxide finish, each, ideal for performance builds.

PAC Racing Springs PAC-1225-16 valve springs. Features 1200 Series Drag Race dual spring design, 644 lb/in rate, 1.150 in coil bind, 1.550 in OD, set of 16, ideal for drag racing applications.

PAC Racing Springs PAC-S101-16 valve spring retainers. Features inside design, 0.060 in thick, 1.550 in OD, 0.575 in ID, 0.855 in spring ID, chromoly, set of 16, ideal for performance builds.

PAC Racing Springs PAC-S183-16 valve spring shims. Features 0.030 in thick, 1.040 in OD, 0.575 in ID, steel, set of 16, ideal for precise valve spring adjustments in performance builds.

PAC Racing Springs PAC-KS92 valve spring shim kit. Features 0.015/0.020/0.030/0.050 in thick shims, 1.500 in OD, 0.645 in ID, steel, 64 pieces, ideal for precise valve spring adjustments in performance builds.

PAC Racing Springs PAC-R501-16 valve spring retainers. Features 500 Series, 10-degree lock angle, 1.185 in/0.865 in/0.635 in OD steps, triple spring compatible, titanium, set of 16, ideal for performance builds.