Two years is a very short life span for a valve train in a street application.
It failed for a reason, take all efforts to find out WHY ? before you proceed.
Post some close up pic's of the failed parts just maybe we can help.
I agree. Something is wrong. There isn’t much load on those rivers unless something is off.
I forgot to mention there should be as close to .0000 taper across the lobes as you can get. I’ve seen some lobes that had .0015 taper and my buddy fought it scuffing the roller on the lifter and some other stuff I no longer remember (1987...yes I’m old).