I think the 16 heads have screw in studs don't they? I don't know why they used those springs. I thick they are standard replacement. I guess when I get my replacement cam. I should just plan to replace the springs. I don't have a tool for that but I guess I can get one. Like to do it leaving the head on the block in car but if it becoms to confusing, I guess I can remove heads and take to machine shop.

Just checked my cranking compression and I have two cylinders hit 200 PSI. Most are 185-200 PSI. No wonder it pings on 93 octane.