LS .660" Dual Valve Spring Kit Steel Retainers 4.8 5.3 6.0 LS1 LS2 LS3 SK001 USA Engine Mounts High Heat deflection

High Heat deflection

1 - Internal Baffle

Works excellent for high-horsepower

CNC machined flange

LS .660" Dual Valve Spring Kit Steel Retainers 4.8 5.3 6.0 LS1 LS2 LS3 SK001 USA Engine Mounts High Heat deflection. 660" Dual Valve Spring Kit Steel Retainers 4. 8 5. 3 6. 0 LS1 LS2 LS3 . 660" Lift Dual Spring Kit for LS engines using stock rocker arms. Kits ship standard with dual polished springs, locks and the following: Chromoly Steel Retainers Locators for Stock Guides (. 505" ID . 060" Thick) Black Valve Seals Spring specs are 155 lbs @ 1. 780", 380 lbs @ 1. 180", 400 lbs @ 1. 130, coil bind @ 1. 070" This is a drop in spring kit for all 15 degree LS heads