Originally Posted by RadarRider
7.3's are known to have injector 'cackle', which can be pretty loud @ times, especially when you have the #8 injector intermittently being starved. Try a contribution test with a scan tool & see if you have any injector codes 1st.
Thanks for the comment. After posting the thread, I took the truck to 6 different mechanics. About half were diesel. They all told me # 1 rod was making the noise. After all said and done, My warranty and used car dealer are either replacing the engine with a short block or finding a used motor. The used dealer could not believe this was the case, and frankly I couldn't either. Sounds like the person that sold this to the dealer, masked the problem.
Before I posted the first thread, I had a mechanic perform a scan and he found nothing.