[rotorwrench]

I looked at the photos on the HAMB and I can see the casting marks on the front left that indicate it's Canadian ancestry. They are a lot like the US made 59A but are just a bit different. The keystone shaped lower coolant port in the mid section of the deck looks like the prewar design since the US 59s have the round lower port there. US prewar 19A & 29A blocks look like that but they have the intake deck that looks to be raised up but they just reduced the amount of iron in the casting so the flanks of the flange are actually lower than the machined deck area. That one is milled flat all the way across like the post war engines and the 38 through 40 engines. In 1946 the Windsor engine was changed to the 69A and had insert type con rods so Canada did it first. Trucks used the straight through relief in the cylinder desk to reduce compression a bit. This type block works well with crow foot chamber aluminum aftermarket heads. Just finish the relief a little better and it's good to go.

The Windsor Canadian engines are a mix of characteristics when compared to the Dearborn USA engines. They generally always have a "C" on them before the prefix to indicate the origin.