GMC last manufactured the 228 in the US in 1953. in 1954 and 1955, the 248 was the smallest engine made and 56 and later, the 270 was the smallest engine. In Texas and many other states, vehicles were titled by the engine number. It was common when a replacement engine was installed, that the original engine was ground off and the original number stamped on it to match the title. Factory engine numbers were evenly spaced. If someone restamped it, the numbers are usually a little crooked. A228 would be a correct engine number for a 49 1/2 ton.