BTR: LT1 .660" or .685" Double Spring Kit [Corvette, Camaro, Truck, LT1, L83, L86] calvo Will work on modified LS1/LS2/LS6

Will work on modified LS1/LS2/LS6 engines also

Valve Springs Included:Yes

WXM Manifold Spacer - reduces the heat transfer from the cylinder heads to the manifold where the intercooler bricks are

- Screams at High RPMs

A pushrod that fits one engine may not necessarily work in another

BTR: LT1 .660" or .685" Double Spring Kit [Corvette, Camaro, Truck, LT1, L83, L86] calvo Will work on modified LS1/LS2/LS6Option 1: . 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" Option 2: . 685" Lift Dual Spring Kit for LS engines using Limited stock rocker arm setups and Roller Rockers. Includes dual springs,