his spring kit contains PAC 1204X Dual Valve Springs, matching titanium retainers, your choice of locators, locks, and seals.
Spring Specs are 145 lbs @ 1.800, 385 lbs @ 1.150, Coil Bind 1.000", Max lift .700"
This is a drop in spring kit for all 15 degree LS heads including: LS1, LS2, LS3, LS4, LS6, L76, L92, L99, LQ4, LQ9, L33, LSA...etc. This kit will not fit LS9 engines. It will fit LS7 heads with the proper amount of shims.