Yes I was surprised to also see oil come out of the exhaust. She will start right up with no problem and I will let her run for about 5 min. During this time I will get about 1/2 quart of OIL and a lot of blue smoke out of the exhaust. I found this The casting number (not the orderable part number) is 603-016-xx-01, where "xx" is the revision number. So I would think that it's a number 20 head?

Pete