Weiand made these for stock car racing. I believe they were meant to duplicate Ford's special "Denver Heads"that were made in aluminum especially for high altitude use and therefore had a higher compression ratio. Since the originals were made by Ford, they were legal in most stock car racing associations. When the original "Denver Heads" came into short supply, Weiand stepped up. I have heard that it was a higher step than Ford took. These may also be Ford "Denver Heads"; they are externally identical (for obvious reasons). EDIT : Here's a little more information from guys that know a lot more than I do : https://www.fordbarn.com/forum/showthread.php?t=69804.
These heads do not have any Weiand markings or Ford part numbers, and when I cc'd them they are the same as stock iron heads. No other markings other than the cast in "MADE IN USA" and "FOR A". They were in new condition when I bought them about 10 years ago, but as cast. I had them polished. Here is another view.
Made in Canada script alloy heads are not uncommon down under. Our first flathead I polished a set of Canadian heads and they came out great. But that was 40 years ago and my budget was slim.
The Jalopy Journal
