Gen 5 LT1 Premium .660" Polished Double Spring Kit With Titanium Retainers. This valve spring kit is excellent for high performance or racing use for up to .660" lift using stock rocker arms. This kit includes valve springs, titanium retainers, valve locks, spring seats and valve seals. 

NOTE: There is a different part number for Gen 5 LT4 engines. Please search for Gen 5 LT4 valve springs if you need this kit.

Spring specs:

155 lbs @ 1.780"380 lbs @ 1.180"400 lbs @ 1.130"coil bind @ 1.070"