The spring pressure you listed is about 1/2 of what is required for both the seat pressure and open pressure for a roller cam. The Buick springs that keep being mentioned as upgrades are for flat tappet cam use, not roller cam. Also, stock rockers will not survive long with a roller cams spring pressure, and you can also break the rocker shafts and pedestals too. Stock replacement valves will also snap the heads off if not upgraded to race quality material, along with machined retainers and locks instead of the stock stamped retainers and locks. Are you sure about your numbers?
