Some Break-in Ifo from Crane

Ya know.... you made me stop and think.... and I think you are 100% correct. Seems like it WOULD be the rocker ratio times the valve spring pressure. It should work as you say for any simple lever system. Yep, the sum of the moments has to be 0 and the shorter moment arm has to have the higher force. THANKS FOR THE CORRECTION, MOPEkidD-3.

Now I gotta go back and rework my lifter pressure...... looks like it will be well ABOVE 250 lbs over-the-nose. (Out-of-the-box Edelbrock springs on their Performer RPM AL heads.)

This all started because I was gonna just pull the damper out but measured the damper and found that it only reduced the valve spring pressure at full lift from 285 to 270 lbs. I found some lighter springs (Melling 466114) but did not want to 'spring' $80 for just breaking in the new cam. Might just have to do that though.

And Moper, I have paid attention to your comments on lifter rotation at start up and even in build testing. Seems pretty wise.

Looks like most all standard performance valve setups are violating the 300 lbs over-the nose pressure for normal running including the Crane parts, so that number will be struck from my original post, unless I can find better info the back that up. I do know that I broke in a new Crane cam many moons in the past with springs that would have put well above 250 lbs on the lifter, and that cam was good for about 100k miles.......sooo, take that 250 number FWIW....