[DeTomaso] Interesting Hall Pantera header oddity

[L GRAY]

   Mike,
    The big bores for standard 4V steel heads were semi rectangular with that odd intrusion caused by the header bolt area.
     The Ford SVO alloy heads had different port heights and some had purely round port configuration. Those headers “would” bolt to steel standard port location but would eventually eject the gasket, do to the closeness of the port cooking the gasket and blowing it out. 
    One of your pic’s clearly shows the misalignment of the exhaust running into the offset flange. 

Leslie A. Gray

> On Feb 20, 2019, at 8:00 PM, Mike Drew <MikeLDrew at aol.com> wrote:
> 
> Les,
> 
> Yes people have suggested that. But would those fit on a regular 351C?
> 
> Larry Stock sent me a photo of a ton of headers in a box and I thought most of not all were the round port style?
> 
> Mike
> 
> Sent from my iPad
> 
>> On Feb 20, 2019, at 19:23, L GRAY <tipo874a at msn.com> wrote:
>> 
>> The other “odd” set is probably for a set of old SVO high port heads. That’s my best educated guess after having worked for Hall for several years. 
>> 
>> Leslie A. Gray
>> 
>>> On Feb 20, 2019, at 6:02 PM, Himes, Terry (397C) via DeTomaso <detomaso at server.detomasolist.com> wrote:
>>> 
>>> 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
>>> 
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>>> 
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