PSI Triple Valve Spring (16) 1.660" OD & 1.130" Coil Bind
395LBS @ 2.250" Seat Pressure, 1178LBS @ 1.200" Open Pressure

You can trust PSI valve springs to out-perform all others as they are made from the finest materials, the best CNC equipment and state of the art trade secret processing they also utilise special heat treating and additional "Special Processing" for minimal load loss.