X2 on what 46Sparky said on engine replacements not being stamped. My '51's original 216 was replaced in early '54 with an engine that was not stamped. I even tried an acid etch to see if the serial number had possibly been machined off, but no evidence of that. They documented the engine swap with a brass plate screwed to the valve cover.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.