When a valve is as stuck as you describe, sometimes the hot wrench can free it up. Remove the valve spring and retainer. The shadetree way to do this is to use a 5/8" deep well socket and your brass hammer. Align the socket on the retainer over the valve stem and smack it hard enough to collapse the valve spring. A couple of hits usually cause the valve keepers to pop out of the retainer. With the spring out of the way, apply a propane torch at full power to the base of the valve guide, moving the flame around the circumference. Allow it to cool slightly, spray with solvent, whack valve stem with brass hammer, repeat as necessary.
As you surmise, the professional solution would be to rebuild a pair of heads with new valves, guides, seals and springs. That's a few more bucks, but it would be done for your lifetime.
jack vines
As you surmise, the professional solution would be to rebuild a pair of heads with new valves, guides, seals and springs. That's a few more bucks, but it would be done for your lifetime.
jack vines
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