Tim has it right. Small fitting on the passenger side of the cylinder head. Makes sense its just hole drilled to access another part of the head that needed a hole and then plugged later. Its no surprise people try to pipe more oil to the top end of the engine. When I primed the oil pump with a drill after several minutes I seen a very unimpressive amount of oil making it to the top end of the engine. Is there any aftermarket high flow oil pumps available for the 235 engines?
