.660" Lift Dual Spring Kit for LS engines using stock rocker arms. Includes dual polished springs, locks and your choice of:
- Titanium Retainers
- Locators for Stock or Bronze Guides
- Valve Seals
Spring specs are 155 lbs @ 1.780",
380 lbs @ 1.180",
400 lbs @ 1.130,
coil bind @ 1.070"
, this kit will also fit LS7 heads with approximately .045" of spring shim,