Re: Mystery Engine Knock
The book Model A Ford Mechanics Handbook, Vol. I has a Troubleshooting Chart 4.6, Engine Noises on page 4-8.
Number 2 is Valve Noise which can be caused by loose valve stem or guide or stuck valve. The book recommends trying to squirt oil into the carburetor while the engine is running to try and loosen a stuck valve. I know you have looked at that but it could be that a valve is sluggish and not completely stuck so that it only happens when the engine is running.
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