Yep i agree phil it is a mostly flathead issue.the canadian M37 chrysler 251L6 and a lot of the heavy truck applications use the sodium valves.what u do is turn the block uoside down so the oil can run down into the giude area.Ive also found that well used tranny fluid works better than new for some reason.
heat the valve head with a propane or mapp gas torch will draw the oil down into the guide with little worry of damage..add a generous portion of patience..and i use the cam to gently work the valves as carefully as possible..add a little oil and heat.work it a little..repeat..itll usually come.
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Stab it and steer...
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