I don’t but the open and closed pressure for the stock springs depends on the motor. 55 and earlier mechanical cam/stick motors and different then the hydraulic motors. Keep in mind the springs were designed for cam lift in the .404 range so not likely are capable for much beyond that, which is probably why the corvette cam/261 cam can use stock springs and why the bull dog cam at .435 needs to use an upgraded spring.
Jerry and I have a friendly disagreement about cams. I love and have always loved big cams. They are not for everyone. But they are for me, lol.
