BTR
BTR LS DUAL .660 Spring Kit - Steel Retainers
They are designed to be used with stock rocker arms. If you go the roller rocker route, see part # SK002. This is a drop-in kit for 15° LS heads. It will also work with LS7 heads when used with a .045” shim (Part numbers SS015 +SS030). This kit will not fit LS9 engines. See part # SK006 for LS9 heads. The kit includes dual polished springs, locks, and your choice of: •Titanium or Chromoly Steel Retainers •Locators for Stock or Bronze Guides •Valve Seals
Spring specs:
•155 lbs @ 1.780"
•380 lbs @ 1.180"
•400 lbs @ 1.130
•Coil bind @ 1.070"