Stingray, The 1926 GMC one ton was a K-16 and was basically the same truck from 1923 to 1926. My literture has the engine as a GMC 4cyl with bore of 3 1/2 and a stroke of 5 1/2. The serial number should be on the left hand spring horn ram and the engine number on the left side of crank case. Serial numbers for 1926 were K-1626043 and up. Only 2801 were made.
