Lifter failure

For my 440, I bought a comp cams FT cam (recently made, not old gold), but I bought a set of Johnson Cam Saver lifters from Crower.

I used Comp break in oil, and have since been running Brad Penn zinc oil, 10W40 (bearings were a little looser than i expected when i plasti gaged).

Break in went great, and this is second year running strong fingers crossed.

No idea what of the above saved my cam, my guess is the cam saver lifters. Partially because of the channel machined into them for more oil, and because I think Johnson are pretty good quality made in the USA lifters