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Author Topic: Dashpot correct for early G.T.500  (Read 1558 times)
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Chris Thauberger
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« on: February 14, 2017, 09:33:16 AM »

Need some guidance please. Which one of the following is correct for Jan G.T.500?

I'm thinking the first one, but have many pictures of second one installed.

For what its worth I don't have either one yet, but the second one is easier to find.



Thanks

Chris







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68blk500c
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« Reply #1 on: February 14, 2017, 10:12:12 AM »

It is my understanding that the second type is what you (and I) need--without the spring, plus white plastic body portion.
Don.

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« Reply #2 on: February 14, 2017, 10:13:54 AM »



Nos carb courtesy of Bill C

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Chris Thauberger
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« Reply #3 on: February 14, 2017, 11:38:07 AM »

Good to know. As I said I have more picture of the bottom one. Don't know why I thought it was the all metal one.

Thanks Don/Pete


Chris  Chug a Lug

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68blk500c
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« Reply #4 on: February 14, 2017, 12:01:18 PM »

Pay attention to the mounting nut.

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gt350hr
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« Reply #5 on: February 14, 2017, 12:20:32 PM »

   Early , non KRs ( C8ZX carbs) use that one. I believe the cut off was Feb '68.

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owner 6S477 HERTZ White w/Blue stripes-1of18-since 1974. OVER 3,500 drag strip runs made in it since then. My candidate for the "worlds Most drag raced Shelby" More added all the time.
Chris Thauberger
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« Reply #6 on: February 14, 2017, 02:03:41 PM »

Ok. So back to being confused. Randy are talking about the second picture with the plastic front?

Pete's picture is of an NOS carb. Would it be different from an assembly line carb circa Dec 1967?

 Undecided


Don, I forget what your build date is.




« Last Edit: February 14, 2017, 02:23:28 PM by Chris Thauberger » Logged

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Paul Orr
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« Reply #7 on: February 14, 2017, 02:18:25 PM »

Chris,

181 is a 11/25/67 build.  The carb date code is 7A4 and has the white plastic dashpot.  Not sure if it is correct, but hope it helps!

 Chug a Lug

Paul

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gt350hr
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« Reply #8 on: February 14, 2017, 03:00:04 PM »

    Sorry ,
          The metal back , white plastic version ( #2 in the pics) is correct. The later one (after 3-68) is the same as the 428CJs used IIRC.  They are very different. The one in the top pic is for a 4100 Autolite .

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owner 6S477 HERTZ White w/Blue stripes-1of18-since 1974. OVER 3,500 drag strip runs made in it since then. My candidate for the "worlds Most drag raced Shelby" More added all the time.
Chris Thauberger
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« Reply #9 on: February 14, 2017, 03:32:14 PM »

 OK that clears it up.  I need some crown royal I think I'm gonna go lay down for a while.

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68blk500c
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« Reply #10 on: February 14, 2017, 08:22:10 PM »

Chris, my build date is Mar. 5--later than yours, but I have been coached that the #2 version is correct for my PI.  Coaches: please join in.

Randy, your mention of a Februaryish change is the first I've heard of that.  I certainly recognize your experience; can you point to some reference on this change?  Thanks, Don

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gt350hr
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« Reply #11 on: February 15, 2017, 09:33:21 AM »

        Don ,
          I'm sure there was some "overlap" and would keep yours using the "early" one. I have seen later ( original 851 date) carbs with the dashpot like the KR's used. Unfortunately no one is around from Holley's Warren Mi days that can provide the dates and reasons things changed.  There is an early and a late KR carb deal too but that's a whole other can of worms.
     Randy

« Last Edit: February 15, 2017, 09:36:10 AM by gt350hr » Logged

owner 6S477 HERTZ White w/Blue stripes-1of18-since 1974. OVER 3,500 drag strip runs made in it since then. My candidate for the "worlds Most drag raced Shelby" More added all the time.
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« Reply #12 on: February 15, 2017, 01:30:18 PM »

picture #1 is Autolite carb
picture #2 is Holley as in C8ZX A. Also used on 390 Holley
KR uses different

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« Reply #13 on: February 15, 2017, 06:14:19 PM »

Can anyone add to the above info the reason for the addition of a dashpot ?

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Rodster-500
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« Reply #14 on: February 15, 2017, 10:40:45 PM »

Can anyone add to the above info the reason for the addition of a dashpot ?

Generally for anti-stall under sudden off throttle condition.

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