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Old 10-20-2010, 10:41 PM
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Old school Holley info needed

I have a Holley List # 3316-1s was told it is a 950 three barrel. It does have 2 primarys and one massive secondary. However I cannot find this list number anywhere. Can anybody help I would like to get specs on this.

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Old 10-21-2010, 01:55 AM
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List # 3916-1s is the 950 cfm Three Barrel carb. Long since discontinued, including parts.

Rebuild gaskets are the same as an 850 double pumper/855 vacuum secondary, just cut the divider from between the rear barrels in the main body to throttle plate gasket. The larger than normal 3 Barrel vacuum diaphram is also discontinued, you have to modify and adapt a Mopar Six Pack Holley 2 Barrel diaphram to fit the 3 Barrel housing(pod).

Front jets are 80 stock, rear is #4(IIRC) metering plate which equals 93 jet(I know this is correct). 30cc accellerator pump, #31 nozzle(shooter).

Carb is basically an 850 Vacuum Secondary with the divider cut from between the rear barrels and the rear boosters moved a little closer together to compensate, to make 950 cfm. I have two of these carbs I use, the diaphragm is the hardest thing to replace during rebuilding due to having to modify one from another carb.

Many 950's are missing the bigger vacuum secondary can and have an cheap aftermarket gear drive 1-1 link on the secondary's, and a special tube'd shooter to feed all 3 barrels. I have no idea how well these mechanical secondary conversion parts actually work, the two carbs I have have the correct large vacuum secondary pod on them

Both of my 950's have had a 50cc accelerator pump swapped to them, and a larger shooter #35 or #37. Both are on 7400rpm 400 SBCs with aftermarket heads and single plane intakes.

There is also a 1050 Three Barrel, List # 4604, it has a 50cc front pump and no booster rings on the rear boosters, just two fuel delivery pipes in the rear barrels. Same baseplate as the 950 has.

Yours still have all the trap-door choke hardware still on it?? - spring loaded plate, cable link, and lever assembly??

Last edited by ericnova72; 10-21-2010 at 02:01 AM.
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Old 10-21-2010, 04:02 AM
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These 3 bbl carbs were the precurser to the Dominator series that are still used today. Back when this carb was new, Edelbrock designed intakes for them that include a notched plenum divider to allow the secondaries to open.

Secondary plates #27 (= to 89 jet) and #45 (= to 96 jet, both w/a 0.040" idle bleed) are all I see Holley currently listing that would be close to the unlisted #4 plate.
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Old 10-21-2010, 09:00 AM
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Yes mine looks brand new and has all the items you described. Are these worth anything.
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Old 10-21-2010, 05:24 PM
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I paid $100 15 years ago, and $20 two years ago, for the two I have that are complete. Prices vary based on someone really wanting it or really wanting a deal, and on whether the seller knows what he has and how fast you want to sell it.

They seem to go mostly in the $50-200 range on Ebay for a used complete core, less if parts are missing. There are several listed on Ebay in the $400(rebuilt)-$800(NOS brand new never used)range but none of the high priced ones have sold that I have noticed in the last 6 months.

Holley's newer 950HP and 1000HP carbs have killed the 3 Barrel's value somewhat, along with no parts availability.

If you have a motor big enough to use it and can deal with the rebuild issues they work. I love mine and always keep my eye open for more of them on the cheap.
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Old 10-21-2010, 05:36 PM
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I haven't owned one yet, maybe someday if I can find one for a fair price. There's one (950 cfm) on eBay, yesterday it was @ $50, but I'd expect to pay more than that for a decent one.

About the same time Hot Rod had a big splash on the 3 barrel carb, darned if the local "rich kid" had bought a PAIR of them, mounted them on a tunnel ram on- get this- a 273 Barracuda!!!

This loser fiddled and fussed w/them for the best part of a week before disconnecting and blocking off one of them and drove around (barely, mind you- it was pig rich) on just one carb. With a TR!!

John, where ever you are- you sure were a dumb ***. LOL
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Old 10-21-2010, 05:58 PM
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On Ebay now- 1 listed at $51(2 bids so far) but has a $150 reserve, it is complete but missing external choke linkage, choke blade still there, 2-1/2 days left on auction;

1 listed at $95(no bids so far) but is missing secondary vacuum can and converted to gear drive secondary, 4 days left;

1 at $300(no bids) with a $450 buy-it-now, it is complete with a swapped on 50cc pump but missing the choke assembly, 3 days left;

1 at $600(no bids) complete and NOS never installed, 2-1/2 days left(been there for several months now)
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Old 10-21-2010, 07:02 PM
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cool item

What a cool carb.... .....

How long have they been discontinued?

I see them so rarely at swap meets any more. I suppose you would need a 500 ci caddy to need one though.
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Old 10-21-2010, 07:50 PM
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Quote:
Originally Posted by Onefunponcho
What a cool carb.... .....

How long have they been discontinued?

I see them so rarely at swap meets any more. I suppose you would need a 500 ci caddy to need one though.
I can't tell you when they were discontinued, early to mid 70's time frame I think, right after the first gas crisi I think Info is hard to find, even Holley's Tech line is not helpful, nobody knows anything old there anymore it seems.

My 406 SBC lives mine, and I've run one for a short time on a friends 383 drag engine until he found a deal on an 825 DemonRS, the Demon isn't any faster, but we haven't tried the 975 venturi sleeves and calibration yet.
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Old 10-22-2010, 09:20 AM
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The 3-bbl carb (as I understand it) was initially brought into being for NASCAR racing because a larger CFM was required for the (then) 426 Hemi and 427 Chevy and Ford/Merc's. Because 850 was near the max that could be had from a square bore 4-bbl, Holley did the oval secondary 3-bbl to get the extra flow.

Soon, it became evident the design left something to be desired, so after fiddling around for a bit, Holley came out w/the Dominator that solved ALL the problems associated w/CFM, and the rest as they say, is history.

I do not know how long the 3-bbl was available after the intro of the Dominator. I suspect the 3-bbl lasted until the carbs on hand were sold- so if one knew when the Dominator came out, I'd guess within 6 months to a year at the outside, the 3-bbl was gone.
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Old 10-22-2010, 04:15 PM
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Thanks for the info guys

I agree people that know about the old stuff are getting few and far between these days...

Its a real shame
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Old 10-22-2010, 08:55 PM
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Quote:
Originally Posted by cobalt327
427 Chevy and Ford/Merc's.
Should have said 429 Ford/Merc's, but the expiration date passed for editing my post. Again.
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