I have a '99 P-pump 24v I'm working on for a customer. He just broke the second billet cam in less than 5000 miles. It is a name brand cam with all matching valve train. The engine is around 850 HP, not spun over 4k RPM. No fault was found the last time and I sent the cam to the manufacturer for inspection. They could not see an issue, but supplied me with new parts. I'm just trying to figure out where the problem may be, looking for any input.