27-01-17, 06:13 PM
A tiny amount of air leakage like that is unlikely to cause damage. It might make it trickier to get a good idle and balance the carbs, but making the mixture lean enough to burn out valves would be very doubtful.
Why not whip a couple of plugs out if you're concerned? I'd be surprised if the one you're using for the oiler's vacuum feed is running noticeably hotter.