No visible smoke when driving except at slow speeds after driving at highway speeds and no apparent power loss. Engine is operating at normal coolant temperatures and oil level is in the safe range.
I agree that people behind me when driving at slow speeds will not be my fans so I will try to limit that situation but car shows tend to require a fair amount of such driving between the entry point and the eventual parking spot.
I should have leak down results in a week or so and probably will determine how best to hold an intake valve in place so I can remove one valve spring and get a good visual of the stem seal. I am pretty sure I can find a tool to compress the valve spring with the head in place (my normal spring compressor requires the head to be loose). If the problem is stem seals I can probably remidy that with the engine in place but just about anything else will require engine removal and tear down.
