[Joe]

Oil Pressure? Not sure, no reference in video so not sure what your experiencing. In my case I have not seen a change to the oil pressure with the busted manifold bolt, certainly the sound you are experiencing.

if your seeing an oil pressure issue may be some other issue then the manifold bolt. Given the sound cadence with throttle check your belts, pulleys, and tension otherwise I''m guessing your in the motor and I'll leave that to far more knowledgable folks to troubleshoot.