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Old 06-30-2011, 06:07 PM   #1 (permalink)
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Holley Carb ID

Had an original carb on a 6500 GMC truck we use to haul a dozier. It was a 4 barrel Holley carb. It was replaced 10 years ago with an Edelbrock 2 barrel . I'd like to put a 4 barrel carb back on it, but need help with the ID of the Holley carb, which I was told could not be rebuilt. Here are the numbers off the old Holley carb.

Numbers are: 793981
LIST-7386
1186



Engine is 366, manual choke.

What's compatible, and currently available, with the above Holley 4 barrel, regardless of brand.


Thanks in advance.




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David B.
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Old 06-30-2011, 06:12 PM   #2 (permalink)
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Go to Vatozone, buy an adapter plate, and put a quadrajet on there.
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Old 06-30-2011, 06:36 PM   #3 (permalink)
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Go get ya an List # 1850 Holley. Pretty close to the same on the linkage side without all the govener BS.
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Old 06-30-2011, 09:32 PM   #4 (permalink)
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Shows up on here;

http://www.carbkitsource.com/carbs/n...7002-8999.html
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Old 07-01-2011, 12:16 AM   #5 (permalink)
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I think that truck would have a holley 4150 on it with that weird governor stuff on it. Just get a run of the mill 4150 or 4160 for it.
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Old 07-01-2011, 05:06 AM   #6 (permalink)
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Did you look up the truck on Rockauto and see if their is a carb kit listed?
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Old 07-01-2011, 05:07 AM   #7 (permalink)
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Quote:
Originally Posted by yozsi View Post
I think that truck would have a holley 4150 on it with that weird governor stuff on it. Just get a run of the mill 4150 or 4160 for it.
It has the governor stuff on it. I'm wanting to know what cfm the original Holley carb had along with other specifics, so I can replace it with something similar.

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Originally Posted by Quick & Dirty View Post
I had found that, but the Holley Carb can't be rebuilt, and unfortunately, the link doesn't give any specifics about the carb.








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David B.
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Old 07-01-2011, 05:13 AM   #8 (permalink)
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Originally Posted by Camarogenius View Post
Go to Vatozone, buy an adapter plate, and put a quadrajet on there.
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Originally Posted by 85f150dsel View Post
Did you look up the truck on Rockauto and see if their is a carb kit listed?
A GMC 6500 isn't listed on any "computer look up" programs I have found, so therefore according to most "Vatozone" employees, my truck doesn't exist.




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Old 07-01-2011, 05:22 AM   #9 (permalink)
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Have you tried or had someone look in alldata?

I have the program at home but that PC is turned off so I can't check right now.

Worst case, buy a universal Holley kit?
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Old 07-01-2011, 05:57 AM   #10 (permalink)
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Dedicated truck Holly carburetors may look like a generic 1850 Holley with a governor but there are differences.The truck carb has jetting and air bleeds calibrated for constant heavy engine loads.Every heavy duty V-8 gas engine of the past used a Holley carb,2300 two barrel or a 4150 four barrel.That would be GM,IHC ,Ford and Dodge.The reason is the Holley design is better at constant wide open throttle.
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Old 07-01-2011, 06:06 AM   #11 (permalink)
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And the list number you gave,7386 most closely matches the 7386A shown in the Holley master catalog I have. The original application is a 1976 GMC 366 engine,Federal spec,4000 rpm governor. The Holley rebuild kit number is 85R-4975-S. Actually any Holley brand master kit for a 4150 carb will work.Be sure to compare the numbers on the power valve to be sure it's the same.Summit or Jegs will have genuine Holley kits for reasonable money.
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