Competition Cams 26926-16 Dual Valve Springs Seat pressure: 129 lbs. @ 1.835 inch, Open Pressure: 470 lbs. @ 1.160 inch O.D.: 1.320 inch, I.D.: .654 inch Ideal for street/strip hydraulic roller, some solid roller and some solid flat tappet race applications Extended .675 inch maximum lift, 1.320 inch O.D. Cutting edge dual valve spring design with added processes for durability and performance