Bill,
I wish I had pics with me to show, but here is the gist.
There is a hole in either end of the cylinder head that blocks off the ends of the oil galley that runs under, and feeds, the stud oiling. I removed the plug on the front end, used a tap to thread it to accept a pipe plug that I drilled a relief hole through the center. (notes: 1. The plug has to be ground down so when fully installed it does not hit the bottom of the first rocker stud in the galley, or I guess it could just hang out the front also. 2. I determined the size of the one relief hole per head by adding the diameter of each of the original stud oiling holes and drilled 1 hole that size. Just a logical guess and could be changed.)
To answer your question now. The oil squirts out the bypass hole and just returns to the crankcase by running out the hole at the end of the head per original design.
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