BTR: LT4 .660" Double Spring Kit [Corvette Z06 ZR1, Camaro ZL1, CTS V, LT4 LT5] progressive 1-approved and made from premium

1-approved and made from premium A36 steel plate material

efficiency vs

exhibited no hot or cold start issues

Does not fit convertible

BTR: LT4 .660" Double Spring Kit [Corvette Z06 ZR1, Camaro ZL1, CTS V, LT4 LT5] progressive 1-approved and made from premium. 660" Lift Dual Spring Kit for Gen V LT4 LT5 engines using stock rocker arms. Includes dual polished springs, matching LT4 specific titanium retainers, LT4 specific locators for stock 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 LT4 engines, WILL NOT FIT OTHER GEN V ENGINES, SEE SK007