On "some" small flat head engines (best I recall but no warranty thats been years ago and no idea which engine) I was able to unstick valves by spraying PB Blaster etc down in the spark plug hole and using a long thin punch to lightly tap tap tap until they closed down (cam in right place of course).
However, if the valve faces and seats are rusted and pitted the valves may never seat/seal all that well????
I have also cleaned and re used those head gaskets and never had a problem in the event you have to do it the "right" way and remove the head so you can re seat the valves and lap them in with valve grinding compound etc.
It depends on how bad they are stuck and whether or not the faces and seats are rusted/pitted, but no harm in trying to unstick via the plug hole if possible???? and no harm in trying the old gasket if its not all pulled apart by removal ??
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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