Competition Cams 26915-16 Beehive Valve Spring Seat pressure: 105 lbs. @ 1.800 inch, Open Pressure: 293 lbs. @ 1.200 inch O.D.: 1.055 inch (Top) 1.290 inch (Bottom), I.D.: .650 inch (Top) .885 inch (Bottom) Designed for hydraulic roller cams .600 inch maximum lift, 1.290 inch O.D. Originally designed for LS engine applications but will work in 5.7L Hemi engines and many others