I am going to see where his power from the unit is coming from. he may have hooked it to the HEI positive Battery wire. I heard that does not work all the time you need to use a relay and feed it with battery positive not power from ignition switch. Odd thing is it did it all of the sudden. He did mention that he had revved it to 7200 rpm and thought that may have messed something up. But many days after that is when it started. No bent pushrods and no ticking and cranking pressures are the same as when he first put it together. So no bent valves etc.