TSP .660" Dual Valve Spring Kit w. Titanium Retainers - LT1 / L83 / L86 TSP Gen 5 LT1/L83/L86 .660" Dual Spring Kit w/ PAC Springs, Titanium Retainers, & PRC Integrated Seat/Seal The all new TSP Gen 5 LT1/L83/L86 .660" spring kit featuring PAC valve...