Will this work?

[39fordtruck]

What causes this wear on each lobe?

 

[VeryTangled]

 

[19Fordy]

Could the camshaft be moving forward ad back? Wrong or worn timing cover?

 

[40cpe]

It looks like low spots on the lobe where the parkerizing didn't wear off.

 

[flatrod]

The bottom of the lifter is not flat. As it comes to full lift it makes that wear pattern.

 

[Charlie ny]

It appears as though at day one in the life of that cam the index between the rough lobe grind and finish lobe grind was off a smidge. That's a great candidate for a KIWI TONY
L-100 regrind.
Charlie ny

 

[deuce_roadster]

I think the radius of the bottom of the lifters is 68"