3B water manifold/head info requested

[auditude at cox.net]

Hello,

I would like to find out as much as I can about the water manifold on a 3B head.  Does anyone have any dimensions or pictures of the manifold and the ports in the head?

I am thinking of converting a 7A head to have 4 water intake ports like the 3B head.  Currently it has one, and people say that the (main/only) difference is that the 3B head has ports for the water manifold.

I have decided that I don't have to modify the head to actually use the factory manifold.  I can probably get away with machining some port and threading in some aftermarket fittings and create an external manifold that would do the same thing.  I would just need to understand where the underlying water passages are.

If I go the path of fitting a factory 3B water manifold to the head, then this information could be used for other 3B owners wanting to be able to use the more plentiful 7A heads for repairs or upgrades.

So, any help would be appreciated.

I doubt anyone might have one, but if there are any junk 3B heads around that I could borrow or have to take measurements, that'd be great.  :-)

Thanks,

Ken