PAC Racing Springs PAC-1237X-16 valve springs. Features RPM Series dual spring design, 550 lb/in rate, 1.045 in coil bind, 1.274 in OD, fits GM LS-Series, set of 16, ideal for performance builds.

PAC Racing Springs PAC-1238X-16 valve springs. Features RPM Series dual spring design, 600 lb/in rate, 0.985 in coil bind, 1.274 in OD, fits GM LS-Series, set of 16, ideal for performance builds.

PAC Racing Springs PAC-1280X-16 valve springs. Features RPM Series ovate beehive design, 386 lb/in rate, 1.181 in coil bind, 1.077 in/1.282 in OD, fits GM 604 crate motor, set of 16, ideal for...

PAC Racing Springs PAC-1529-16 valve springs. Features 1500 Series circle track dual spring design, 560 lb/in rate, 1.090 in coil bind, 1.284 in OD, set of 16, ideal for circle track racing.

PAC Racing Springs PAC-1204X-16 valve springs. Features RPM Series dual spring design, 369 lb/in rate, 1.000 in coil bind, 1.290 in OD, fits GM LS-Series, set of 16, ideal for performance builds.

PAC Racing Springs PAC-1206X-16 valve springs. Features RPM Series dual spring design, 409 lb/in rate, 1.000 in coil bind, 1.290 in OD, fits GM LS-Series, set of 16, ideal for performance builds.

PAC Racing Springs PAC-1275X-16 valve springs. Features RPM Series beehive design, 408 lb/in rate, 1.215 in coil bind, 1.034 in/1.290 in OD, 1.040 top OD, set of 16, ideal for high-performance builds.

PAC Racing Springs PAC-1276X-16 valve springs. Features RPM Series beehive design, 409 lb/in rate, 1.070 in coil bind, 1.034 in/1.290 in OD, 1.040 top OD, set of 16, ideal for high-performance builds.

PAC Racing Springs PAC-1218 valve spring. Features 1200 Series ovate beehive design, 313 lb/in rate, 1.140 in coil bind, 1.290 in OD, fits GM LS-Series, each, ideal for performance builds.

PAC Racing Springs PAC-1215-16 valve springs. Features 1200 Series ovate beehive design, 313 lb/in rate, 1.140 in coil bind, 0.885 in/1.290 in OD, fits GM LS-Series, set of 16, ideal for performance...

PAC Racing Springs PAC-1218-16 valve springs. Features 1200 Series ovate beehive design, 313 lb/in rate, 1.140 in coil bind, 0.885 in/1.290 in OD, fits GM LS-Series, set of 16, ideal for performance...

PAC Racing Springs PAC-1218X-16 valve springs. Features RPM Series beehive design, 313 lb/in rate, 1.140 in coil bind, 0.885 in/1.290 in OD, set of 16, ideal for high-performance builds.