1963 Pontiac Grand Prix - The Mysterious SD Grand Prix
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You can see the VIN stamp here on Bruce's engine block. Note how the numbers don't line up and you can distinctly see a "3" stamp under that of the first "2" in the "14022" stamping. Part of another number seems to be under the "0" stamping. When run through PHS, the number reveals a 421 H.O. Tri-Power engine. There is a "3" and a "5" on the block, which would normally be the engine block code, but they have been stamped above instead of the usual place below the motor unit number (203163). Are the "3" and "5" part of the engine code "135U" or "13-5," either of which would denote a 405-horse 421 SD engine? If so, a "1" is not clearly visible and neither is a "U" in the photo. Bruce says traces of a "1" can be seen somewhat far left of the "3" and "5." According to Pontiac paperwork, the block code should be "11T" for 421 H.O. Tri-Power, but there seems to be no sign of it here. View Related Article
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