My 1982 Virago has 22,000k and has never had any oil leaks until the last month or so. Leaks have begun around the outside of both front and rear cylinder head gaskets next to the crankcase. I have snugged up the 3, (three) allan screws on each side with no success. It has been suggested that there is increased pressure in the crankcase that has to be addressed. Is there a crankcase vent or other vent that may be plugged? All sources I have checked are vague on location etc. Any help will be appreciated.

Looks like there is a crankcase vent hose attached to the cam chain sprocket cover

Removed to inspect/test and found no blockage. What other, oil pump surge or blocked journals would cause this?