what cause this comp lifter to go bad?
what cause this comp lifter to go bad? 
The cam and lifters was bought used together from a well know person on this board..i inspected them. Every looked almost new.(only had a few pulls and passes on cam and lifters) After 1300 miles of breaking in new engine..lifters went bad and took out the cam..what caused this? Any help would be greatly appreciated.
BTW this is the second time a set of comp lifters went bad. The housing on the lifter broke(by the pin) and took out the cam on my other ls1. Has comp had a problem the lifters..these are the 850-16 on both engines
pushrods good.It has adjustable valvetrain. machine works in greenville texas did all the machine and checked everything. they set up the spring pressure and checked pushrod length. dead on.
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that cam was in a ls2 (402) 11.8 cr,TFS heads,etc... the plastic guides were new. my old ls1(382) had even a bigger cam(258/264 previous owner) it had 8-10K on cam before lifter broke.
