Difference between EAB and EABB heads

[Old Magnet]

I see in my parts manual there is a reference to using a "B" head gasket.
I wonder if that has something to do with it?

 

[38 coupe]

The pictures posted are not clear enough to see differences in the combustion chambers. If the EAB-B is shallower than the 8BA, then it is a typical EAB. If the EAB-B is not shallower than the 8BA, then it is an odd (and rare, but not valuable) variant with a larger combustion chamber.


I see no head gasket difference needed with the pictured cylinder heads.
The "A" and "B" head gasket instructions are for Model A and Model B engines using stock or high compression heads.

 

[cars2cool]

They will be going to the machine shop soon to get cleaned up and magna-fluxed. Where can I find the measurements of pocket depth for the different heads?

 

[Flathead]

The EAB-B heads have an asymmetrical shape chamber that should improve breathing, probably what Ford was intending.

 

[Kube]

To me it looks like they used the EAB pattern, then modified something and added the -B at a later date. Possibly at the foundry

For Ford to add that B suffix, something was changed enough so as to make it incompatible with the first design.