BTR LS9 .685" LIFT VALVE SPRING KIT - SK702/0560/LS9 When you decide to take a walk on the wild side and exceed the .660†limit of our popular Platinum Spring Kit, the next step is our .685†Spring Kit. A higher spring rate and titanium retainers will ensure valvetrain stability with radical camshafts. FOR LS9 ENGINES ONLY! The kit includes the following: • SP010-16 • SR006-16 • SL505060-16 (stock or powder metal guide) • VS LS KIT • VL7°8MM-32 Spring specs are as follows: •170 lbs @ 1.800" •380 lbs @ 1.180" •450 lbs @ 1.115 •Coil bind @ 1.000"