Quite a few things will cause the cam go go away....but Im convinced it happens at startup or shortly after. Mostly it is either not enough cam lube, or too much cranking before the engine starts, which wipes all the lube off the lobes and lifters. Spring pressures play an important part too, make sure the springs are what is recommended by the cam mfgr....Set your timing as close as possible so the engine will start right away, and make sure there is gas in the carb float bowls. When you put your lifters in, make sure they turn freely in their bores. A lifter that doesnt turn when the engine starts will wear out in no time. Follow the instructions to a tee, and you'll probably be OK...at least that way, if the cam does go bad, the company will no doubt replace it for you, like DrBowtie said. Best of luck to you, hang in there. Hot rods, nothing but trouble, huh???