PAC Standard Duty 1904 Dual Spring Kit (Not For Racing Use)
Kit includes Spring Seats, Valve Seals, Dual Springs, and Titanium Retainers (utilizes GM factory valve stem locks, not included)
Will Work On All LS Engine Variants Excluding LS9; LS7 Will Require Additional Shims
Specs:
OD Outer: 1.290
ID Outer: .950
ID Inner: .694
Installed Height: 150 @ 1.800"
Open Load: 400 @ 1.125"
Spring Rate: 370
Max Coil Bind: 1.010"
Max Lift: .625"