Fortunately you caught this before there was catastrophic damage. The damage you have is manageable. Why did this happen specifically on one lobe? That can be hashed out in these posts forever without a clear answer. As one of the few on the forum who still have little issue with flat tappet cams, this is just one more example that a roller is not a 100% cure for wiped cam lobes. It did enjoy a pretty good life span for a performance engine. In the time period you purchased and installed these lifters, Comp and many others were sourcing lifter wheels and needle bearings from various Chinese vendors. There were a considerable number of failures as we know and everyone was pointing fingers and blaming suppliers. So much so that in this time frame Crower began making all the wheels in house and axles. Also only US sourced needles. That is not the case today as they feel they have found some quality imports for some components. All we can do as end users is try to buy the very best components we can afford and cross our fingers. Hope you can get it all back together and save that camshaft.
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