Author Topic: Choke heat riser for 427  (Read 1344 times)

PhilS

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Choke heat riser for 427
« on: May 16, 2018, 06:47:47 PM »
Does anyone have pics of or info relating to the exhaust manifold heat riser for carb choke on 427s?

Bob Gaines

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Re: Choke heat riser for 427
« Reply #1 on: May 16, 2018, 07:09:27 PM »
Does anyone have pics of or info relating to the exhaust manifold heat riser for carb choke on 427s?
Duel four?
Bob Gaines,Shelby Enthusiast, Shelby Collector , Shelby Concours judge SAAC,MCA,Mid America Shelby

PhilS

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Re: Choke heat riser for 427
« Reply #2 on: May 16, 2018, 07:22:51 PM »
Single 4.

Dan Case

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Re: Choke heat riser for 427
« Reply #3 on: May 17, 2018, 10:49:15 AM »
I won't claim to be an expert on this subject but CSX32xx and CSX33xx chassis with 4V induction. Not much different than CSX31xx 2-4V induction except on opposite sides of the engine.

I don't recall what it is called it but there was a special heat capturing fitting threaded into an exhaust manifold. (A new old stock fitting was offered on ebayŽ about three months ago. I have seen two different lengths for sale. I don't know the length of the one used in a 427 Cobra but it can't be real long.) A soft copper tube connected the fitting in the manifold to the choke mechanism on the carburetor. A soft flexible asbestos fiber based woven tube covered (insulated) the copper tube.

The hard to duplicate detail is that the insulation tube that is not a Ford part. The one person that I know that has been successful finding an exact match did so hunting old inventory in old pre-national chain flood parts stores and that was a long time ago.
« Last Edit: May 17, 2018, 03:40:21 PM by Dan Case »
Dan Case
1964 Cobra owner since 1983, Cobra crazy since I saw my first one in the mid 1960s in Huntsville, AL.

gt350hr

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Re: Choke heat riser for 427
« Reply #4 on: May 17, 2018, 02:27:00 PM »
  The original tubes are mild steel similar to that used for brake and fuel lines except 1/4" dia tube. Because of the "log" style cast iron manifolds used , the tube would be very close to one for a '65 Thunderbird or Galaxie offering which used the log style manifold. It would not be the same as the production 427 tube which used "header looking" , long manifolds. I am not aware of a reproduction but there may be.
     Randy
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Dan Case

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Re: Choke heat riser for 427
« Reply #5 on: May 17, 2018, 02:58:14 PM »
  The original tubes are mild steel similar to that used for brake and fuel lines except 1/4" dia tube. Because of the "log" style cast iron manifolds used , the tube would be very close to one for a '65 Thunderbird or Galaxie offering which used the log style manifold. It would not be the same as the production 427 tube which used "header looking" , long manifolds. I am not aware of a reproduction but there may be.
     Randy

All the intact unrestored 427 Cobra pictures (includes dirty one owner low mile cars) I have show a copper tube, including new CSX31xx engines during installation at Shelby's works. Unrestored cars I have seen in person had a few as 800 original miles to less than 10,000 miles with copper tubes.

Not all 2-4V cars hot air choke pull off systems in the CSX31xx and CSX30xx S/C ranges. In a few cars a special plug provided by Holley sealed the choke inlet and the thermostatic control cover was remarked with a new nominal index by hand. The plug was actual something used briefly by Ford in 427 R Code engines, briefly but long enough to get shown in a TSB.
« Last Edit: May 17, 2018, 03:06:15 PM by Dan Case »
Dan Case
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PhilS

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Re: Choke heat riser for 427
« Reply #6 on: May 17, 2018, 03:04:06 PM »
Thanks for the responses. I have one for a 67 R code Fairlane but it is 1-2 inches too long. I have never seen a correct one so I might just section mine. Once installed it would be hard to detect as long as the nut end is alike.

Dan Case

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Re: Choke heat riser for 427
« Reply #7 on: May 17, 2018, 03:08:35 PM »
Thanks for the responses. I have one for a 67 R code Fairlane but it is 1-2 inches too long. I have never seen a correct one so I might just section mine. Once installed it would be hard to detect as long as the nut end is alike.

The insulator cover is visually the tough thing if exact day one appearance is desired. The original tube covers were pretty fragile and would come apart. I have seen unrestored 427 Cobras with just a scrap of original cover hanging off a copper tube.

Send me your e-mail address in a PM (private message) on this forum and I will send a couple of very unrestored car pictures.
« Last Edit: May 17, 2018, 03:13:32 PM by Dan Case »
Dan Case
1964 Cobra owner since 1983, Cobra crazy since I saw my first one in the mid 1960s in Huntsville, AL.

Dan Case

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Re: Choke heat riser for 427
« Reply #8 on: May 17, 2018, 03:24:24 PM »
Images sent.
Dan Case
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PhilS

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Re: Choke heat riser for 427
« Reply #9 on: May 17, 2018, 03:33:31 PM »
Got them. Thank you.

Dan Case

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Re: Choke heat riser for 427
« Reply #10 on: May 17, 2018, 03:38:27 PM »
Got them. Thank you.

You are welcome. This is the closest "old" kit I have seen and the tube and cover are probably way too short. The heat pick up fitting looks great.

https://www.ebay.com/itm/1955-56-57-58-THUNDERBIRD-FORD-LINCOLN-MERCURY-AUTOMATIC-CHOKE-CONTROL-HEAT-UNIT/183229376067?hash=item2aa9526643:g:W34AAOSwvD5aEx-K
Dan Case
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PhilS

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Re: Choke heat riser for 427
« Reply #11 on: May 17, 2018, 03:57:11 PM »
Yes it does look good and the depth would certainly work.

gt350hr

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Re: Choke heat riser for 427
« Reply #12 on: May 18, 2018, 10:12:29 AM »
   My apologies Dan ,
          I was thinking of the tube for a Galaxie or T Bird not a Cobra. I have corrected my notes.
        Randy
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Dan Case

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Re: Choke heat riser for 427
« Reply #13 on: May 18, 2018, 01:08:27 PM »
No problem.

I don't do all that much on research on 427 Cobras so I don't know near as many details on manufacturers, materials, and part numbers as I do for Cobras. I do collect information that I can comb through as required.
Dan Case
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gt350hr

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Re: Choke heat riser for 427
« Reply #14 on: May 18, 2018, 02:02:54 PM »
 Dan it is entirely possible that the "universal" over the counter kit was used because of the low volume nature on this engine combination. A 427 Cobra with a single four , cast iron manifolds and rear exit exhaust is pretty rare! Obviously the 428 is more common , but still a small number.
Celebrating 44 years of drag racing 6S477 and no end in sight.