Cam & Timing Set Questions

I lost a Comp SFT after approx 800 miles....my buddy lost a Mopar SFT after many thousand miles. I did everything right...break-in, Brad Penn oil,etc(not my 1st engine build or cam install) No explanation for my buddie's?? I replaced mine with a Comp solid roller...he replaced his with the same Comp SFT that I lost. This was a number of years ago...both are still going strong.

Sorry....no help with the chain question, I don't recall what I used.