Valve Springs COMP CAMS SINGLE 1.460" O.D.X1.060" I.D. 308 LBS/IN RATE 1.494 Inch OD Valve Springs The valve spring creation process is far more involved than most people realize. Comp Cams Engine Valve Spring Kit - 901-16. $88.95. QTY The result is a product that meets and exceeds the expectations of today’s engine builders and racers., Seat pressure: 101 lbs., @ 1., 650 inch, Open Pressure: 242 lbs., @ 1., 250 inch , O., D., : 1., 494 inch, I., D., : 1., 080 inch Single Outer Valve Springs from COMP Cams allow you to build the perfect spring assembly for your application Single Outer Valve Springs from COMP Cams allow you to build the perfect spring assembly for your application. Isky 8005-A Dual Valve Springs w/ Damper, 400 lbs./in. Rate, 1.16 490 inch max lift at recommended installed height