Removing valve assembly
David,
Although I haven't been playing with a flathead, I have checked a online copy of "Repair Manual Ford and Mercury V8 Engines" that says that the "valve guide bushing" has to be pulled down before removing the valve guide retainer. Hope this helps.
On edit: Other reading suggests there were two types of valve stem, one that would match Alex's description and another with the equivalent of the tapered keys built into the valve stem so that the process of moving the bushing to remove the retainer and then pulling the bushing and valve as a unit out of the block would have to be followed.
Grant
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