Seat pressure doesn't mean much-its spring rate and open pressure that should be considered first. What if you had a spring that had 200 seat and 300 open? Would it kill a lobe? J.Rob
A point I left out, not always looking for debate, but that's right....aside from break in, open psi would be the thing to watch and a lobe killer.
I won't break in a sft with all the spring it calls for...I go light at first....and like you say, get it fired within a few revolutions.
I used a beer can full of fuel for many years to splash prime a motor to life. I use the same distributor & ignition components to be sure I don't have any gremlins. I've had 380psi open kill one...I remember those paw springs...I think I still have them at the back of the shelf...I've been there before...experimentation costs you sometimes...doh....funny thing with that cam , its almost the same cam I'm running. Custom Herbert grind, no one liked it at the time...but at the time there were very few commenting on it who knew a fkn thing about anything, they thought "Eww..where's the 110 lobe?"..lol