Posted by Joe Cimoch on February 07, 1999 at 12:09:28:
In Reply to: serial number posted by Ryan Furber on February 07, 1999 at 11:28:19:
Try the passenger side above the front axle, I think that where is located on the later trucks.
My engine has a date code (2334) that corresponds to Dec 18, 1967. Thats for a 1968 WM300. I have date codes for 67 and 68. Post the number, someone might have a parts book with your date code information.