Its a long story but the pushrods were too short and the threads on the rocker adjuster nuts were not fully engaged. Also the preload (hydraulic lifters) was not properly set.

We were making T&T runs and all of a sudden the car started going faster and faster. In 3 runs it dropped around 0.8 seconds! On the final run it lost the water pump belt and overheated.

When it overheated 2 pushrods fell out. That's when I found out the valve train was a mess. I found several cups in the lifters with cracks.

At that time the lifters looked suspicious but not real bad. 26 runs later the lifters are shot.

I have put upteen cams in my cars over the last 35 years. Never had on fail due to break in until now. There is definitely something to be said for today's oil and metallurgy. I'm going with a hydraulic roller..........