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Old 08-18-2019, 02:58 PM   #1
EAV8
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Default "B" on top of Model A Ford cylinder head

I just bought a Model A Ford "cylinder head" at the Springfield, MO swap meet and it has a letter "B" on top of the head about an inch tall. No other markings. One guy told me it might be a "high compression" head. Does anyone know what the "B" stands for. Thanks
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Old 08-18-2019, 04:04 PM   #2
Chuck Sea/Tac
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Default Re: "B" on top of Model A Ford cylinder head

It is a higher compression had made by Ford for the police and emergency type vehicles. I believe it’s 5.2 ratio.
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Old 08-18-2019, 04:04 PM   #3
Charlie Stephens
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Default Re: "B" on top of Model A Ford cylinder head

Ford came out with a high compression head for the Model A. Originally it was sold to police departments and became known as a Police Head. Later it was released to the general public. In order to identify it the letter B was placed on top of the head. Over the years this has caused a lot of confusion as in 1932 when the Model B was released (and through 1934) the heads had a letter C on them.

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Old 08-18-2019, 05:22 PM   #4
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Default Re: "B" on top of Model A Ford cylinder head

Get it magnafluxed before using it,they are prone to cracking,excellent combustion chamber design.
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Old 08-18-2019, 05:37 PM   #5
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Default Re: "B" on top of Model A Ford cylinder head

Quote:
Originally Posted by Charlie Stephens View Post
Ford came out with a high compression head for the Model A. Originally it was sold to police departments and became known as a Police Head. Later it was released to the general public. In order to identify it the letter B was placed on top of the head. Over the years this has caused a lot of confusion as in 1932 when the Model B was released (and through 1934) the heads had a letter C on them.

Charlie Stephens
And thus the myth that Ford made a Model "C" engine!
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Old 08-18-2019, 05:48 PM   #6
Richard in Anaheim CA
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Default Re: "B" on top of Model A Ford cylinder head

That is part of the myth of a Model C engine. Most of us call it a Model C if it has the cast counterbalanced crank which was changed without notice or new part number sometime after 1932 or 1933.

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Old 08-18-2019, 05:57 PM   #7
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Default Re: "B" on top of Model A Ford cylinder head

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Originally Posted by Richard in Anaheim CA View Post
That is part of the myth of a Model C engine. Most of us call it a Model C if it has the cast counterbalanced crank which was changed without notice or new part number sometime after 1932 or 1933.

Richard
Anaheim CA
Also a late B called a "C" grind cam. .319 measured lift.
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Old 08-20-2019, 03:13 PM   #8
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Default Re: "B" on top of Model A Ford cylinder head

yes it is 5.2 compression.
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Old 08-20-2019, 03:47 PM   #9
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Default Re: "B" on top of Model A Ford cylinder head

This is why I have been calling it :

"The Police head with the large B" ... for more than 50 years. (5.2 to 1)

"The head with the large "C" for the other one. (4.6 to 1)

Last edited by Benson; 08-20-2019 at 03:53 PM.
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Old 08-20-2019, 07:56 PM   #10
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Default Re: "B" on top of Model A Ford cylinder head

And "C" does not mean it has a counter balanced crank.
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