I recently read about a dyno test that didn't go well. Nick's Garage.
Blown head gasket. Oil feed. It gets smoky at 32:30, bad gasket at 48:30.
You can't say you're so special as to be the only one! Not any comfort in that I'm sure.
I never did find anything to read about the 'fix' or what was wrong. A deck problem, head problem, gasket problem, torquing the head with an impact wrench...I don't know.