Since the thread started it was suggested numerous times, and has been thoroughly checked more than once, from the owner, and the people doing the diagnostic work, there isn't an exhaust leak.
The noise is most pronounced in the distributor area and seems to be a metallic rapping. It has been listened to with a long rod and a mechanics stethoscope and when the engine was returned to the builder and disassembled there was a lower bushing destroyed in the distributor which was replaced by the manufacturer.
I wasn't aware that the latest guy doing the diagnostic work had pulled the distributor and noted that the newest gear was showing a uneven wear pattern after only 2 hours run time. There is a possibility that even though there is no runout of the drive gear on the cam as observed through the distributor hole, that there is a manufacturing defect of the teeth as far as the helical cut of them.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
Last edited by Sirrotica; 08-21-2019 at 10:08 AM.
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