Fact is camshafts or either cast or ground on a solid billet. What happens during a failure is another thing altogether. The cams, whether Mopar, Ford, Honda or any other USA manufactured brand all come from one of two companies...CMC or CWC. And there are only a couple different materials and heat treat procedure for every cam made. Tried and true formulas. The LS I believe oils the roller and the Hemi does not. The Johnson lifter introduces pressurized oil to the roller via a drilled passage as I see it. That oil makes the difference.