[DeTomaso] How to ID Aussie heads??

[Larry Weston]

There are also a couple of exterior differences that will allow you to spot Aus heads bolted to an engine.
First, the outboard stand alone head bolt boss has a square head, all USA heads, 2v or 4v versions, have a round head.
Second, all USA heads have extra material in the casting below the outbound rocker cover rail and corresponding extra thickness leading towards the ends of the intake manifold face to allow for drilling of the head to create the passages and ports for the air injection to exit through the little bumps in the exhaust ports.
Aus heads do not have the little bumps in the exhaust ports.

Sent from my iPhone

On Dec 2, 2021, at 1:38 AM, Mike Drew via DeTomaso <detomaso at server.detomasolist.com<mailto:detomaso at server.detomasolist.com>> wrote:

Larry,

It’s super simple. Aussie heads have the quench combustion chambers (same as early US 4V heads) but the smaller 2V port size (same as all US 2V heads).

Mike

Sent from my iPad

> On Dec 1, 2021, at 18:29, Larry Finch via DeTomaso <detomaso at server.detomasolist.com<mailto:detomaso at server.detomasolist.com>> wrote:
>
> All,
>
> I currently have three pairs of iron closed-chamber cylinder heads. Two pairs are bare cylinder heads.  All three pairs are for sale.
>
> One pair is complete and freshly rebuilt with no miles, but from what I can tell it was not a performance rebuild.
>
> I was told one of the bare pairs is the desirable Australian closed-chamber heads.
>
> If that is true then one of the two versions in this photograph would be Australian. I see distinct differences in the spark plug areas.
>
> Can anyone tell from this photo, or provide other clues for me to check?
>
> Thanks in advance,
>
> Larry
>
<IMG_8378.jpg>
>
>
> Sent from me using a magic, handheld electronic gizmo. _______________________________________________
>
>
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   There are also a couple of exterior differences that will allow you to
   spot Aus heads bolted to an engine.

   First, the outboard stand alone head bolt boss has a square head, all
   USA heads, 2v or 4v versions, have a round head.

   Second, all USA heads have extra material in the casting below the
   outbound rocker cover rail and corresponding extra thickness leading
   towards the ends of the intake manifold face to allow for drilling of
   the head to create the passages and ports for the air injection to exit
   through the little bumps in the exhaust ports.

   Aus heads do not have the little bumps in the exhaust ports.
   Sent from my iPhone
   On Dec 2, 2021, at 1:38 AM, Mike Drew via DeTomaso
   <[1]detomaso at server.detomasolist.com> wrote:

   Larry,
   It's super simple. Aussie heads have the quench combustion chambers
   (same as early US 4V heads) but the smaller 2V port size (same as all
   US 2V heads).
   Mike
   Sent from my iPad
   > On Dec 1, 2021, at 18:29, Larry Finch via DeTomaso
   <[2]detomaso at server.detomasolist.com> wrote:
   >
   > All,
   >
   > I currently have three pairs of iron closed-chamber cylinder heads.
   Two pairs are bare cylinder heads.  All three pairs are for sale.
   >
   > One pair is complete and freshly rebuilt with no miles, but from what
   I can tell it was not a performance rebuild.
   >
   > I was told one of the bare pairs is the desirable Australian
   closed-chamber heads.
   >
   > If that is true then one of the two versions in this photograph would
   be Australian. I see distinct differences in the spark plug areas.
   >
   > Can anyone tell from this photo, or provide other clues for me to
   check?
   >
   > Thanks in advance,
   >
   > Larry
   >
   <IMG_8378.jpg>
   >
   >
   > Sent from me using a magic, handheld electronic gizmo.
   _______________________________________________
   >
   >
   > Detomaso Email List is not managed by POCA
   > Posted emails must not exceed 1.5 Megabytes
   > DeTomaso mailing list
   > [3]DeTomaso at server.detomasolist.com
   > [4]http://server.detomasolist.com/mailman/listinfo/detomaso
   >
   > To manage your subscription (change email address, unsubscribe, etc.)
   use the links above.
   >
   > Members who post to this list grant license to the list to forward
   any message posted here to all past, current, or future members of the
   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.
   _______________________________________________
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