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Hoping for an update, did you get the engine cleaned out and running yet?

A wet rifle bore brush to clean the passage out good and you should be good to go!

Here is a thought, It appears the valve is hollow. If you take a steel rod that will fit inside of it, heat the rod and put it in the valve, it might melt the oil varnish enough to free the valve.

Thanks for the visual, Charlie, Never seen one before, I was going by guess as to what they may look like.

Again, I am not familier with the layout of the oil passeges, but if you have the oil pump gears off and can locate the passege to the valve, use your solvent on both sides of the valve. If you have access to an air compressor and rubber tipped air gun put pressure in the oil passage and with a...

I have never seen what the valve looks like so I may be off base here. If worse came to worse and it were mine, I would check with Bill Watson or David Kelone and see if they might have a replaement valve. If so, then do what ever it takes to get the old one out, Drill it, tap it and use a pller...

could be a problem with the oil pressure regulator valve. Remove left shroud and look for the hex bolt by the oil lines. Remove and clean and check for damage to plug, spring and valve.