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Joe K · 10-13-2025, 12:48 PM

The judging standards indicate either 3, 4, or 5 row depending on the source and final destination of the radiator. They varied both in round tube or oval (slanted) tube. And there was some variation in the "layout" of the tubes depending.

1930s radiators are shown as "Ford" with three rows of slanted oval tubes, or "Ford Commercial" as four rows of slanted oval tubes.

The Judging Standards don't specify the "fins per inch" of any of the five variants.

The tube arrangement for both 30-31 is each tube directly behind the tube in front of it. (i.e. no angular displacement.)

Addendum: The source for the Judging Standards is "The Model A as Henry built it" by DeAngelis/Francis/Henry which adds "132 fins" for the passenger 30-31 and "140 fins" for the commercial 30-31. You can do the arithmetic for a typical height of a 30-31 radiator to get to fins per inch.

Joe K

10-13-2025, 12:48 PM	#3
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 5,022	Re: Radiator core rows The judging standards indicate either 3, 4, or 5 row depending on the source and final destination of the radiator. They varied both in round tube or oval (slanted) tube. And there was some variation in the "layout" of the tubes depending. 1930s radiators are shown as "Ford" with three rows of slanted oval tubes, or "Ford Commercial" as four rows of slanted oval tubes. The Judging Standards don't specify the "fins per inch" of any of the five variants. The tube arrangement for both 30-31 is each tube directly behind the tube in front of it. (i.e. no angular displacement.) Addendum: The source for the Judging Standards is "The Model A as Henry built it" by DeAngelis/Francis/Henry which adds "132 fins" for the passenger 30-31 and "140 fins" for the commercial 30-31. You can do the arithmetic for a typical height of a 30-31 radiator to get to fins per inch. Joe K __________________ Shudda kept the horse. Last edited by Joe K; 10-13-2025 at 12:57 PM.