Stop in for a cup of coffee
There's such a thing as a "Canadian" 318??
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OK.... sooooo Because MOPAR.... This was a thing?
The first V8 made by Chrysler Canada was the new Plymouth engine for 1955. In addition to the 277 Plymouth, they made a 303 cu in version for Canadian Dodges. Remember, there were no Canadian Dodge V8s up until then.
This was the origin of the 303 "Dodge" engine used in the 1956 Plymouth Fury. It was actually a Plymouth engine, enlarged for use in Canadian Dodges.
They went on making this engine, which was practically the same as the US 318 Polyspere engine. The Canadian version was made in 277, 303, and 313 cu in versions as well as the 318.
The wide Poly 318 was used one year longer in Canada than the US, I believe the change was in 1966 in the US and 67 in Canada.
After 1966 the Auto Pact came into effect. This allowed car makers to swap cars and parts across the border without any import duty. So instead of having 2 factories making the same car they would have say, a car factory on one side of the border and a mini van factory on the other side of the border, and swap vehicles back and forth.