Ken, Please tell us about this difference in the 1969 crankcase casting. Thanks, Regards, Bob Helt In a message dated 9/23/2011 6:55:14 A.M. US Mountain Standard Time, kenpepke at juno.com writes: There is a difference in the casting of the '69 crankcase and that difference may also be reflected in some, if not all, of the '68 model year.