[rotorwrench]

Mercury pickups & trucks were Canadian Manufacture and were all set up with the standard 239 CID V8 below the two largest size of trucks. C1BA indicates Canadian Manufacture. All of the 8BA family of blocks are the same from 1948 through 1953 & 54 in Canada with exception of the rotator valves beginning in 1951. USA built engines started doing away with stellite seats but most trucks kept them on the exhaust valves. Most of the casting marks on these engines only had meaning to the factory. Some are date coded by stampings on the flat surface of the intake deck but others are not. The Mercury full size and the Ford Monarch were the only Canadian vehicles to have the 4-inch crankshaft of a 255 CID.