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Old 11/21/2017, 11:25 AM   #1
robert campbell
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Location: Bremerton Washington
Joined: Apr 07
Posts: 3,677

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390 Big Block Holley Carbs

Big Block Boy's & Girl's!!!~
I stumbled across a hidden piece of information concerning the Holley Carbs that came on 1968 390 engines in Mustangs and GT/CS or HCS carbs. This concerns the two following carbs that were built prior to December 15, 1967. Keep in mind this date is "approximate", and these carbs could have found their way onto early 1968 GT/CS or HCS cars with 390 engines. Also many of the original carbs were removed over the years and from time to time these correct carbs pop up on flea bay and are reinstalled by owners.

C8OF-C
C8OF-9510-C Holley list 3795-1 Manual Transmission

C8OF-D C8OF-9510-D Holley list 3796-1 Automatic Transmission

I found a Ford technical service bulletin (TSB’s) titled Article 1283 Momentary Engine Hesitation on Acceleration and/or Rough Engine Idle. These bulletins were sent to the various dealers when problems with cars came to light and provide detailed instructions to correct them. Below is a link to the TSB.

http://fordification.com/tsb/viewtop...c38c2b3f4#p530


This TSB shows how to correct the issue on the December and earlier carbs. Of note in the second paragraph it nots that the later carbs that were corrected receive a daub of white paint on their carb tag. I have the carb for Eric’s new GT/CS to rebuild and guess what. Yup, a daub of white paint is on its tag. I will confirm that the fix was performed, but other carbs I have worked on may have not. Of note I worked on a 3795 for Batgirl and had a bunch of problems with the idle during my wet test of it. I got it close, but never got it right. I hope she can send it back to me for a free rebuild and wet test.
Rob.




Last edited by robert campbell; 11/24/2017 at 12:00 PM..
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Old 11/22/2017, 12:52 PM   #2
calspcl
 
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Location: Seattle, Wa
Joined: Nov 04
Posts: 157

Hi Rob, I just checked the Carb I bought a few years back that needs your expertise. The date code on the tag is 8AE, no white daub...BTW, let me know when you have a stall open and I will bring the whole car with the bent push rod. :)

Dan

1968 390-4speed GT/CS "Acapulco blue is beautiful"
2001 F-350 diesel dually flatbed hauler
1970 bronco
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Old 11/22/2017, 02:55 PM   #3
robert campbell
My Car Details
 

Location: Bremerton Washington
Joined: Apr 07
Posts: 3,677

My Garage
I have a 68 Coupe total redo in between the paint shop and the engine shop, so I have a stall currently. I will have a 67 Fairlane next week, but after that, give me a call. (360) 377-5164.

Carb anytime you can get it here. Your car would be a great wet test platform for both carbs!!

Rob
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Old 11/22/2017, 10:00 PM   #4
calspcl
 
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Location: Seattle, Wa
Joined: Nov 04
Posts: 157

Will give you a shout then, looking forward to you dialing her in!

1968 390-4speed GT/CS "Acapulco blue is beautiful"
2001 F-350 diesel dually flatbed hauler
1970 bronco
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