[DeTomaso] Interesting Hall Pantera header oddity

Wed Feb 20 21:02:16 EST 2019

I remember my Hall Big Bores having rectangular holes. I put them on in 2001 and never
had any problems!  They sound great. I had a mild engine rebuild with nothing crazy.
Engine runs perfect!

"A Purple Heart proves you were smart enough to hatch a plan,
 stupid enough to try it and lucky enough to survive!"

Terry W. Himes
JPL Jet Propulsion Laboratory
Dawn Spacecraft Team
Juno Systems & Software Team
TGO Sequence Lead
Phone: (818) 393-6261
Cell:     (818) 653-8213
thimes at jpl.nasa.gov<mailto:thimes at jpl.nasa.gov>
🇺🇸

From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of Mike Drew via DeTomaso <detomaso at server.detomasolist.com>
Reply-To: Mike Drew <MikeLDrew at aol.com>
Date: Wednesday, February 20, 2019 at 2:30 PM
To: De Tomaso Forum <detomaso at server.detomasolist.com>
Subject: [DeTomaso] Interesting Hall Pantera header oddity

Guys,

You may recall that a few weeks ago I put out a call for two pairs of used Hall Pantera headers on behalf of a pair of local owners. Two of you stepped up first and both sets have been delivered to me. They are both intended for standard 351C engines, and yet they have numerous notable differences.

Last week I showed the header inlet ports in comparison to stock Pantera manifold ports. Both are perfectly round which is odd considering the cylinder head exhaust ports are rectangular:
[cid:4804ffda-ba7f-4b95-b374-5bb141d9b93b at ad.jpl]

[cid:a947d306-5e54-421d-800b-0f8f28912a33 at ad.jpl]

What is interesting to me is that the second set of Hall headers that arrived today, which in theory are supposed to be the same, are markedly different.
[cid:31b92da3-85c7-48b9-8d24-516f92c92a7d at ad.jpl]

Although dimensionally they are the same, the second set has properly shaped flanges. What is most surprising is that they have 1 3/4-inch primaries and a 2 3/16-inch collector while the first ones have much larger 2-inch primaries and yet smaller 2 1/16-inch collectors.

I find this odd in the extreme. I believe the vast majority of the thousands of Hall headers out there have the larger pipes and smaller collectors. Larry Stock has a whole bunch of these rattling around in his shop. Perhaps we can convince Larry to share what he can learn about the ones in his inventory?

Dan Jones—considering that these are primarily being used on relatively mild engines, often through stock mufflers, which ones would you guess are superior?

Mike

Sent from my iPad
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-------------- next part --------------
   I remember my Hall Big Bores having rectangular holes. I put them on in
   2001 and never

   had any problems!  They sound great. I had a mild engine rebuild with
   nothing crazy.

   Engine runs perfect!

   "A Purple Heart proves you were smart enough to hatch a plan,

    stupid enough to try it and lucky enough to survive!"

   Terry W. Himes

   JPL Jet Propulsion Laboratory

   Dawn Spacecraft Team

   Juno Systems & Software Team

   TGO Sequence Lead

   Phone: (818) 393-6261

   Cell:     (818) 653-8213

   [1]thimes at jpl.nasa.gov

   🇺🇸

   From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of
   Mike Drew via DeTomaso <detomaso at server.detomasolist.com>
   Reply-To: Mike Drew <MikeLDrew at aol.com>
   Date: Wednesday, February 20, 2019 at 2:30 PM
   To: De Tomaso Forum <detomaso at server.detomasolist.com>
   Subject: [DeTomaso] Interesting Hall Pantera header oddity

   Guys,
   You may recall that a few weeks ago I put out a call for two pairs of
   used Hall Pantera headers on behalf of a pair of local owners. Two of
   you stepped up first and both sets have been delivered to me. They are
   both intended for standard 351C engines, and yet they have numerous
   notable differences.
   Last week I showed the header inlet ports in comparison to stock
   Pantera manifold ports. Both are perfectly round which is odd
   considering the cylinder head exhaust ports are rectangular:

   cid:4804ffda-ba7f-4b95-b374-5bb141d9b93b at ad.jpl

   cid:a947d306-5e54-421d-800b-0f8f28912a33 at ad.jpl

   What is interesting to me is that the second set of Hall headers that
   arrived today, which in theory are supposed to be the same, are
   markedly different.

   cid:31b92da3-85c7-48b9-8d24-516f92c92a7d at ad.jpl

   Although dimensionally they are the same, the second set has properly
   shaped flanges. What is most surprising is that they have 1 3/4-inch
   primaries and a 2 3/16-inch collector while the first ones have much
   larger 2-inch primaries and yet smaller 2 1/16-inch collectors.
   I find this odd in the extreme. I believe the vast majority of the
   thousands of Hall headers out there have the larger pipes and smaller
   collectors. Larry Stock has a whole bunch of these rattling around in
   his shop. Perhaps we can convince Larry to share what he can learn
   about the ones in his inventory?
   Dan Jones--considering that these are primarily being used on
   relatively mild engines, often through stock mufflers, which ones would
   you guess are superior?
   Mike
   Sent from my iPad

   _______________________________________________
   Detomaso Email List is not managed by POCA
   Posted emails must not exceed 1.5 Megabytes
   DeTomaso mailing list
   DeTomaso at server.detomasolist.com
   [2]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.

References

   1. mailto:thimes at jpl.nasa.gov
   2. http://server.detomasolist.com/mailman/listinfo/detomaso
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