660 Dual Valve Spring Kit Steel Ret LS1/LS2/LS3/4.8/5.3/6.0

660 Dual Valve Spring Kit Steel Ret LS1/LS2/LS3/4.8/5.3/6.0. Part Type: Valve Spring Kit. Engine Type: Gen III/IV Max Lift: 660 Style:Dual. 660 Lift Dual Spring Kit for LS engines using stock rocker arms. This kit will NOT fit LS9 engines This is a drop in spring kit for all 15 degree LS heads including LS1 […]