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Your screen shots show rust where the paint burned off the nuts. I think.
The exhaust gasket is on the other side of the manifold, between it and the block.
Neil had you disconnect the plug so the #4 cylinder would not fire. If there is no fire, It will not burn the fuel/air mixture and there will be no combustion sound—no pop or the "Pisst" that we hear. The "Pisst" is the hot exhaust gas leaking out the failed gasket.
So the noise is gone in that test.
A compression test will not be useful testing for a gasket leak at this spot. A compression test measures only the pressure inside the combustion chamber when both valves are closed. The gasket in question is outside of that; downstream of the ex valve.
Great video, by the way.
Cheers,
Russ
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 Whiskeyjack a '68 Columbia 36 rebuilt A-4 with 2:1
"Since when is napping doing nothing?"
Last edited by lat 64; 09-17-2019 at 02:13 PM.
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