Looks like you found your cause, but unfortunatly the damage is done.
New Cam and lifters with proper break in should solve your problem, although
i would be sure to verify all are spinning. If the lobe on that Cam is gone
remember the metal has to go somewhere, so unfortunatly you may need
to disassemble and inspect the whole engine to remove that material and
replace any effected parts. If the lobe still has its meat, and is only
surface damage you might change the plan some. ( I personally would not)
Summit Lifters are likely the "White Box" ones unless you selected a better option.
They work, but as you have seen should not be trusted without inspection.
This looks like a case of crappy quality control, not a bad design or manufacturing
problem as we have seen in the past. You are one of the lucky ones in that
your problem seems to have shown itself. Still feel for ya, as a new engine with
issues can be very stressful. Hang in there, your on the right track.
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