sorry to hear about his luck...or not so lucky. But, 8000 rpm heads, with hydraulic dog bone lifter and a spyder tray, with 120# seat pressure...I don't think so
...that RPM is solid roller tie bar lifter with 200# + seat pressures...OK
wiping out a cam with roller lifters...humm? oiling issue? something is major wrong...and it's not the cam, lifters or springs...it's oiling or lack of it! or some cheep azz chinezzee roller lifters! don't know
Was this a new engine build 5 years ago for your buddy? Got a build list of parts?