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Well I bought them based on this web site page. Flathead Specifications: 1949-53 V8
All the bores are the same and I would assume the rest is, have not looked yet. If not I am sure some crazed Merc nut is out there at some point.
I was.
I think that these EAC heads will fit on your flathead engine. They are similar to the EAB Ford. I have a set of those on a 24 stud engine.
There is a lot of info on the flathead Ford engines: https://www.google.com/search?client....0.gvixmdyt0kM
If I'm not mistaken EAC heads are Merc heads and if used on a 3 3/4 stroke engine the result is lower compression. The EAB heads were higher compression compared to 8ba heads. The 8rt truck heads were the lowest of them all from what I understand.