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Topic: Holly/Q-jet

in Forum: C3 Fuel, Emission Control, and Exhaust Systems


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Holly/Q-jet (1/15)
 12/4/12 10:57am
manchestersharkLifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 2382

Ermm I have located, for sale, a N.I.B. Holly/Q-jet Carb. It is no doubt for a C-3 Big block. The guy is pushing to sell it. What is it worth? I do not plan to use it myself, but thought a friend of mine could use it on his 454.

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Re: Holly/Q-jet (2/15)
 12/4/12 1:58pm
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


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Is it a Holley, or is it a Quadrajet? Two different carbs. Corvettes never used a Holley spread bore carb...they either had the Quadrajet, or a "normal" square bore Holley. Quadrajets were made either by Rochester OR Carter....The Rochester Carb division did sublet carb manufacturing out to Carter, so either one would be "correct"...but not a Holley spreadbore. Do you have the numbers for the carb? Value is gunna depend on the original application, such as engine size, HP, trans, etc.

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Re: Holly/Q-jet (3/15)
 12/4/12 5:39pm
NorskyLifetime Member
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West Burke, VT - USA

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Not to confuse the topic - but on "The Toy" there is a Holley spread bore.  I found out directly from Holley that it is a Q-Jet replacement made for the 350ci in the 1980s.  And if memory serves the 1970-72 LT-1s had Holley carbs.

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Re: Holly/Q-jet (4/15)
 12/4/12 6:29pm
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Duncanville, TX - USA

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#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


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As a replacement, yes....I should have clarified that, but never as original equipment, which is what I thought Mark was inferring. If the carb in question is simply one that will "fit" a big block, then the value is prolly around $100 or so, even tho it is new.

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Re: Holly/Q-jet (5/15)
 12/5/12 9:21am
manchestersharkLifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


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Posts: 2382

 My querry was for any information on the Holly/Q-jet. I am not familiar with the unit. I have seen one on a 74' 454, and thought they were suppose to be there. The car was sold to him in original equiptment condition as per him.  I'm just learning bout them.  PRICE, Just wonderin if it's worth buying and keeping it for others to use. I have some Q-Jets laying around, and thought another one wouldn't hurt. Depending on price of course.

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Re: Holly/Q-jet (6/15)
 12/5/12 10:11am
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Duncanville, TX - USA

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#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


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Terminology is killin us here....lol! Mark...it is either a Holley Spread Bore, OR a Rochester/Carter Quadrajet. Both are spreadbore carbs, with the large secondary bores, but only the Rochester/Carter is actually called "Quadrajet". IMOH, an original, GM replacement Quadrajet would be worth more $$$ to the right person needing one. A Holley spreadbore is just too common to be worth paying very much, since it was never used on a Corvette from the factory. A pic might help, too... :<)

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Re: Holly/Q-jet (7/15)
 12/5/12 2:04pm
manchestersharkLifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


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WHOOPS!  Can't do pictures, only letters. Not to smart with these putors.  O.K. it must be a HOLLY SPREDBORE. It looks like a Q-jet to me, so.....   Guess I'll let the guy keep it.

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Re: Holly/Q-jet (8/15)
 12/5/12 2:17pm
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


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Holley 650cfm Spreadbore Rochester 750cfm Quadrajet. I may have had a few too many brain farts, but I don't recall ever seeing a Holley-built Quadrajet. I HAVE seen what Holley had that was called the "Econojet", that looked a LOT like a Quadrajet...but was quite a bit smaller, bore-wise, and had several other differences.....maybe that's what the guy has....

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Re: Holly/Q-jet (9/15)
 12/5/12 5:22pm
manchestersharkLifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 2382

Clap YEAH!  That looks like the feller. Has a ? accelerator pump on the front bottom like that one. Electric choke, and the rear bores are much bigger than the front ones. Soooooo......., are they any good? Are they worth anything?  Better/worse than O.E.M.   Embarrassed Sorry, I'm learnin.

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Re: Holly/Q-jet (10/15)
 12/5/12 9:47pm
RedwingvetteLifetime Member
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Waterford, MI - USA

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1973 Red coupe


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I put one of them there Holley spreadbore carbs on my 73 after the motor rebuild. It took a little to get it tuned to my car but it runs real good. Not sure I had any real issue with the original carb but a few beers and a Summit catalog can cause for some new projects just because. After all, just being able to say you have a Holley has to be worth something.

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Re: Holly/Q-jet (11/15)
 12/7/12 11:44am
dads2vetteLifetime Member
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Ash Fork, AZ - USA

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Off topic here, sorry...do you guys remember going to a junk yard and getting performance parts?  4 barrel carbs, posi rear ends...  Now the best "junk" yards that carry that stuff sit on my pc desk and are only a couple clicks away.  I used to love digging for parts, ah the memories.

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Re: Holly/Q-jet (12/15)
 12/7/12 2:40pm
manchestersharkLifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 2382

Thumbs Up Yeah, we brought our own tools and the shipping was WAY WAY less expensive. The bee stings and chasing rattle snakes was not much fun, but the stuff we took home ALWAYS fit.

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Re: Holly/Q-jet (13/15)
 12/7/12 3:51pm
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
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I used to work in a "Wrecking Yard", as they were called back then. Now they're "Salvage" yards. WhatEVER...lol I had access to any part I needed, for whatever car I needed parts for....and they were dang cheap, too! lol I weren't all that excited about crawling under a car with a cutting torch while fighting off rattly snakes, and Black Widders, but I learned a LOT about a lot of different kinds of cars from there. With that said...let's try to veer back to the actual topic....lol.

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Joel Adams
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Re: Holly/Q-jet (14/15)
 12/7/12 11:55pm
F4GaryGold Member
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Grapevine, TX - USA

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1972 LT-1 convertible with factory air.


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Shoot, I thought it said Holey Quadrajet. So much for the Batman reference.

LT-1's had a Holly 4150.

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Re: Holly/Q-jet (15/15)
 12/8/12 11:53pm
73shark
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Overland Park, KS - USA

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1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


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I knew a guy back in the 70s that put a Holley spreadbore on his SBC and he said it had all of the bad features of a Holley and none of the good features of the Q-jet.

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1973 L-82 4 spd

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