.650″ Lift Dual Spring Kit for LS engines using stock rocker arms. Includes PAC 1904 dual valve springs, matching steel retainers, your choice of locators for stock or bronze guides, locks and seals.
Spring Specs are 155 lbs @ 1.780, 400 lbs @ 1.130, Coil Bind 1.030″, Max lift .650″
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 and Gen IV LT1 heads with the proper amount of shims.
PAC 1904 SKS PAC1904 SKS PAC1904SKS