Hy trihawker, the cylinder head casting number is one digit off of the part number of a 1951 Chevrolet cylinder head. This cylinder head could be found on any series 1951 Chevrolet truck except the 17 series which was GMC powered. This cylinder head could be found on a 216 or 235. Trihawker if you would like to PM your address and phone number I could come and have a look if you like.