.660" Valve Spring Kit for early 5.7 & 6.1 Gen 3 Hemi

Product Description .660″ Valve Spring Kit (PSI 1516 or PAC1276) for Early Gen 3 Hemi 5.7 & 6.1 engines. When using this kit, you will re-use your existing OEM stock valve spring retainers and valve locks. This kit includes: 1 set of 16 Premium .660″ Single Beehive Valve Springs (1.290 OD 150 lbs @ 1.800″ / 420 lbs @ 1.140) 1 set of 8 1.250 OD;.875 ID;.060 Thickness Intake Valve Spring Shims 1 set of 8 1.250 OD;.875 ID;.030 Thickness Intake Valve Springs Shims 1 set of 16 Valve Spring Locator/Seats 1 set of 16 Valve Stem Seals SPRING SPECS: 150 lbs @ 1.800″ 420 lbs @ 1.140″ Coil Bind @ 1.080” *NOTE : This kit uses a .090” shims under the intake valve spring to achieve proper valve spring installed height. No shim is needed under the exhaust valve springs. **NOTE : On early 5.7 and 6.1 Gen 3 Hemi cylinder heads, do not exceed .600” intake valve lift and/or .580” exhaust valve lift unless you machine the valve guides for the needed additional clearance.