3b aan heads same

[Bernie Benz]

Further to Nathan’s correct explanation, the base casting for both 3B  
and AAN is the 7A head.
With the addition of 3 holes for the external water manifold, it can  
and has been be used for either.

Bernie


On Sep 9, 2010, at 7:41 AM, Nathan Winters wrote:

> AFAIK:
>
> AAN head has some tapped bosses on the front of the head for a cam  
> position
> sensor.  That sensor is used for timing instead of having a  
> distributor on the
> AAN.  The AAN has the hole for the distributor, Audi just puts a  
> cover on it,
> you can put a distributor in if you want.
>
> You can use a 3B head on a AAN block by welding on a tapped boss in  
> the proper
> location.
> You can use an AAN head on a 3B block by just bolting in a  
> distributor.
>
> So, almost identical.  Interchangeable from AAN > 3B block direct,  
> just put in a
> distributor.  Almost interchangeable 3B > AAN (requires some  
> modification).
>
>
>
>
> ----- Original Message ----
> From: feelstranger <feelstranger at hotmail.com>
> To: 200q20v at audifans.com
> Sent: Thu, September 9, 2010 10:09:40 AM
> Subject: 3b aan heads same
>
> Folks, just cross checking my info with the list wisdom - AAN and  
> 3B heads are
> interchangeable, correct?
> Are they identical, or just interchangeable?
> Thanks!
>
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