.660" Lift Dual Spring Kit for Gen V engines using stock rocker arms. Includes dual polished springs, matching Gen V specific titanium retainers, your choice of locators for stock or bronze guides, locks and seals.
Spring specs are 155 lbs @ 1.780", 380 lbs @ 1.180", 400 lbs @ 1.130, coild bind @ 1.070"
This is a drop in spring kit for Gen V LT1, L83 and L86 engines,
WILL NOT FIT LT4