Replaced right donut gasket today and it was not cause of noise. Continued to look further and noticed black residue around #2 ex manifold on head. It seems the gasket slipped and rotated forward causing the backside to leak. Bolts were tight and it looked like the gasket had migrated somehow to cause leak. Maybe when I put them in during previous work? Anyways, problem fixed for now. I read on Autozone repair guide 2 middle bolts torque to 11 ft and others to 22 ft. Is that correct? Thanks for the assistance fellas! Now onto the radiator leak, again!