Hey Gary,
Factory alloy heads are all based on the AEC721 - the original 12 port
head - casting. Even Joe Armors BJ8 based 1965 Sebring car has a
factory alloy head based on the earlier AEC721 casting, not the later
3000 AEC960 casting.
Denis Welch wanted his head accepted by the FIA - it had to be a
replica of the factory alloy head. Hence AEC721
All the AEC 960 heads i have seen are wrongly machined. See
http://www.myaustinhealey.com/aec960-healey-cylinder-head.html
Chris
Sent from my iPhone
On 18/09/2011, at 1:15 AM, warthodson at aol.com wrote:
> A friend purchased a Healey 6 cylinder head at a swap meet recently.
> It has
> AEC721 cast into it. My BJ8 head has AEC960 cast into it.
> Interestingly, the
> Denis Welch aluminum cylinder head has AEC721 cast into it. How many
> different
> 6 cylinder heads were fitted to the big Healeys & what were the
> differences
> between them? Is there any reason you know for Denis Welch using
> the AEC721
> for the basis of their aluminum head? I did notice that the boss for
> the water
> temperature sensor is much more accessible (I.E. getting a wrench on
> the nut)
> on the AEC721 vs. the AEC960 which raises the question why did the
> factory
> change the design?
> Gary Hodson
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