Cam Motion LS Premium .660" Polished Double Spring Set The Cam Motion LS Premium .660" Polished Double Spring Set is a high-performance valve spring kit designed for up to .660" lift in LS engine applications. Outer Spring Diameter: 1.295" O.D. Install at 1.780" for 155 lbs seat pressure. Open Pressure: 380 lbs at 1.180" Open Pressure: 400 lbs at 1.130" Coil Bind at 1.070" "Everything you need for modifying and upgrading your car is available in one place." "We provide all modification and upgrade parts with the highest quality and the best prices." "Your first destination for parts for sports and modified vehicles." "All original and compatible modification and upgrade parts for various cars are available with us." "With us, you can find everything you need for the world of car modification and upgrades. Send a WhatsApp message with the car's name and the required part."