Quote:
Originally Posted by L-head
I have always understood that "Canadian" or the so called "Denver" heads were the "poor mans" dirt racing heads. Dirt racers would grind the casting or Ford ID numbers off, paint them green, and try to pass them off as cast iron. Weiand also made similar heads in the aftermarket. They supposedly had a higher compression ratio.
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From what I've read and understand, Denver and Canadian heads are not the same thing. Canadian heads are aluminum and made in Canada and Denver heads are cast iron and carry a "S" at the end of their part number.
Here is link from the HAMB and includes some great information from the late Bruce Lancaster.
https://www.jalopyjournal.com/forum/...er-heads.4031/