the covers are a whole different thing, they're notoriously hard to keep sealed and most long time bolt drivers will tell you these ol things just like to mark their territory - that pic shows a poor seal at the back of the rocker cover
but that wasn't your first question, if you have drips from the road draft tube on your parking space, it's indication that when you're on the road the road draft crankcase vent is putting out an oil mist mostly a result of blowby, and as I said, changeing the tube [or even cleaning the filter material in it] isn't going to stop any 'weeping' you see anywhere, and it won't have anything to do with oil seeping higher up unless it's totally plugged causing the engine interior to be pressurized .... if you're using a quart in 300 miles, where you'll find it is all along the roads you drove that 300 miles
check the shop manual about that tube
Bill
