Got a noise coming from my 66\327 SBC that I can't pinpoint. Sounds like it is coming from the back of the engine or around the flexplate/transmission inspection cover, and is loudest on the drivers side. Thinking maybe its a exhaust header gasket, flexplate issue or potentially inside the engine. Car drives ok, can't hear the noise in the interior when driving, but concerned it could get worse in the long run.
Video is in the link below, I tried to capture the sound best I could.
I have done the following:
Checked for exhaust leaks where the headers meet the exhaust, fixed this with a new exhaust gasket. Sound still there
Tightened headers bolts all the way in
Removed rocker cover and looked for obvious play/movement in any components, can't find any.
Jacked up the car for any noticeable damage, none found. I can see the flexplate spins freely when the car is running.
Any idea? I think next I will try a new header gasket, if that doesn't work maybe remove the rocker cover and crank the engine to see if the rockers move like they should.