Troy,
On my Gaerte midget motor we had a valve spring oiler system that ran along the cylider head either above the rocker shaft or between the rocker craddles and the valve springs. It was NOT a part of the valve cover itself. There was a -4 fitting coming into the front side of the cylinder head just below the mounting surface for the valve cover. Connected to that fitting on the inside was a 1/8" or 1/4" stainless tubing that ran the length of the head delivering oil that intern oiled the springs.
Give Tim Sosbe or Jeff Claxton in Rochester Indiana a call if you have any questions. The shop number is 574-224-9467
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