Quote:

In nearly every case the cam will jump forward and the adjacent lifters will contact the neighboring lobes.



Really?? In "nearly every case". Really ?? I think we need to take a poll here !!

There are hundreds of thousands of stock engines out there - wait, make that MILLIONS - with no cam buttons and the cam doesn't budge. This is with the same taper on the lobe and much lighter valvesprings than a performance cam would have.