1968 Holley 950 3barrel Carb List #3916 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-21-2008, 07:43 AM
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1968 Holley 950 3barrel Carb List #3916

Check this out. I believe this is only the second one of these I ever knew to be for sale. Not sure on the numbers. One of those 'Cool' NASCAR things.

Item #270247255993 - 1968 HOLLEY 950 3BARREL CARB LIST # 3916-1S

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Old 06-21-2008, 08:11 AM
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These actually came on a small block chevy. 327/370or375HP. The aluminum intake had the same 3barrel opening. Carb sat sideways.
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Old 06-21-2008, 08:53 PM
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Holley 3-barrel

I currently have three of these and I love them. Two are just sitting , but one has been on my 406 powered 72 Nova for the last ten years. This carb when tuned is faster the all the others I've tried (750and 780 vacuums, 750, 800, 850 doublepump).
The only problem I have is finding the Vacuum secondary diaphram, had to modify a Chrysler Six-pac carb diaphram to make it work. Holley hasn't made diaphrams for these in about 30 years. I also had to go to a 50cc accellerator pump to get enough pump shot.
These carbs are not extremely rare, there are usually 1 to 5 of them on Ebay any given week.
I've done a lot of research on these, and contrary to what SSedan64 has said they were never used on a factory engine package. They were sold by Holley as a performance replacement for the larger Big Blocks of the sixties
(Boss 429, L-88, 440 Magnum), and for racers on anything they wanted.
It's basically a 850 Vacuum with one big oval blade in the back, and the previously mentioned oversize vacuum secondary pod.
There was also a 1050! version, List # 4604. These had NO booster rings in the rear barrel, just downleg discharge pipes, and seem to be a bit more rare.
These were the HP carbs back before Holley even thought of HP.
I would love to talk to anyone who has tried using the vacuum can off of a regular Holley vacuum secondary, or the whole six-pack diaphram assembly on one of these carbs, I've been told that the smaller size won't open the blade correctly
But, lots of people told me the 3-barrel wouldn't work, and I showed them up.

Last edited by ericnova72; 06-21-2008 at 09:02 PM. Reason: more info
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Old 06-21-2008, 10:39 PM
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Think some of the Baldwin/Motion cars had them. Your right they were aftermarket add ons. The Old Edlebrock C3B intake was used for those too. The 3-Barrel opening intakes? I don't know who made those maybe Holley. Saw a few on Ebay a while back.

http://victorylibrary.com/mopar/edel.htm

Last edited by SSedan64; 06-22-2008 at 06:49 AM.
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Old 06-22-2008, 03:55 AM
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I used to see lots of carb spacers at swap meets that looked like the base of that carb, not so much anymore. If you look at aftermarket intakes from that era many of them had a notch in the plenum divider just for that oval shaped secondary, I know my Edelbrock F427 has it, and I think those C3B's do also.
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Old 12-01-2013, 07:17 AM
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Holley 3 Barrell

Hi ericnova, I have one of the Holley 3 barrel carbs,4604 1050 cfm on my 650 hp Nova. Works very well. I am using reg vacuum secondary housing with a quick change kit, mild spring.. The reg vac housing bolts rite on with no issues!!!, It just doesnt sit on angle like original large housing, but now I can tweak the secondarys. I have a 3916 also I am going to do up, using same regular style secondary housing. They work very well!
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Old 12-01-2013, 11:17 AM
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Quote:
Originally Posted by carstechguy View Post
Hi ericnova, I have one of the Holley 3 barrel carbs,4604 1050 cfm on my 650 hp Nova. Works very well. I am using reg vacuum secondary housing with a quick change kit, mild spring.. The reg vac housing bolts rite on with no issues!!!, It just doesnt sit on angle like original large housing, but now I can tweak the secondarys. I have a 3916 also I am going to do up, using same regular style secondary housing. They work very well!
5 year old thread !!
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Old 12-01-2013, 11:19 AM
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This thread is over 5 years old, you could PM these guys and tell them it's reopened.

Oops, T-Bucket saw that too...
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Old 12-02-2013, 06:26 AM
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Dates???

Did not notice dates posted, this site a little hard to navigate thro lol, any ways why would threads be left that long to begin with??? Thanks for info, just try to help.
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Old 12-02-2013, 06:44 AM
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they are left for users to read and maybe grab some useful info. hey no big deal just check the date. also even an old thread can be updated as a new trick ,tool, technology may help the next guy out.
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Old 12-06-2013, 02:56 PM
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Thanks for the update, Carstechguy, I'm always collecting info on these carbs. Glad to know the regular vacuum secondary pod assembly all current vacuum secondary Holleys use will also work on these carbs. I've looked at them and thought it looked like it would work, but hadn't tried it yet.

I"ll try it this coming spring, on the 950 3 Barrel that I have converted to E85 for the new high compression version 406 SBC going back into my Nova.
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Old 12-06-2013, 04:06 PM
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3 Barrells

Let me know how it works for u. I,m always looking for them to buy,getting very scarce, use on future projects.
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