Although the 235 was redesigned in '50, and it appeared in U.S. passenger cars for the first time in the 1950 powerglide cars, it was still low-pressure until the '53 PG model. The 49-53 car shop manual engine section describes the engines.

I don't know what the Canadians may have done.


Curt
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1953 Chevy 6400, 1957 Chevy 2dr Sedan
--"Mediocrity is easy, the good things take time"