Sorry I didn't make this clearer at first. There isn't any provision for the oil line that you would normally see running behind the pushrods. The rear cam bearing (where the line originates) is not tapped. There's no way to run a line other than drilling into the rear cam bearing. The only way the valve train can get oil is via this line running from the driver's side. I've owned many, many 235's over the years and I've never see one like this. As far as I am aware at this time (I'm basically the second owner) this is the original engine.