BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
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 Q-jet question

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Posts : 2301
Join date : 2009-02-22
Age : 36
Location : Mansfield, Ma

PostSubject: Q-jet question   Sun Jun 20, 2010 10:46 pm

Any members know how to rebuild an old Q-jet? I'd rather not mail it off to some random person and hope for the best
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Posts : 1061
Join date : 2010-04-20
Age : 30
Location : Springfield, MA

PostSubject: Re: Q-jet question   Mon Jun 21, 2010 12:35 pm

I can, but why wouldnt you swap over to a holley. Much more tunability and far easier to work on. Regular 4150 4 barrell is the way to go.
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Posts : 111
Join date : 2010-02-16

PostSubject: Re: Q-jet question   Mon Jun 21, 2010 1:15 pm

Outside of taking a stab at it yourself with your vehicle's Helms shop manual, here is a locally well-known place. Has done a lot of good work for me over the years for reasonable money: Hobbs Carburetor Shop
28 Windham Rd
Pelham, NH 03076
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Posts : 2301
Join date : 2009-02-22
Age : 36
Location : Mansfield, Ma

PostSubject: Re: Q-jet question   Mon Jun 21, 2010 3:08 pm

Thanks for the info jvette.

And bf, I would rather an e-brock over a Holley. The 4150 is waaayyy too much carb for my engine anyway. I was leaning towards the e-brock 1400 since it's closer to the right cfm and has the evap hookup.

As for the q-jet, it's just hard to pass up something that doesn't need an adaptor or aftermarket intake and linkages to fit the engine. A core that's non-ccc rebuilt by someone more intelligent then myself should end up cheaper than an aftermarket carb with all the needed bells and whistles anyway.
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Matt Trakker


Posts : 5086
Join date : 2009-07-30
Age : 36
Location : Reading, MA

PostSubject: Re: Q-jet question   Mon Jun 21, 2010 3:23 pm

My car has a simple Holley 570cfm "Street Avenger" on top of an Edelbrock intake, I've never even touched it aside from keeping it clean and the thing still runs great, I think the idle is a little too high though. That being said, I've never met one person who took an Edelbrock carb over the Holley. Everyone I hear says the Holley is much easier to keep running for some reason.

As for Hobbs Carburetor, they are very good and I can also vouch for them. Reasonably priced too, I think the guy charges around 100 bucks for a complete do over on a carb. Maybe a little less, I forget. The shop is in a residential home above the garage.
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Posts : 512
Join date : 2010-11-16
Age : 61
Location : Wrentham

PostSubject: Re: Q-jet question   Mon Nov 22, 2010 12:36 am

bammax wrote:
Any members know how to rebuild an old Q-jet? I'd rather not mail it off to some random person and hope for the best
This info may be of no use to you now, but I just became a member, so here goes. The best book out there on Q-Jets is Doug Roe's Rochester Carburetors by HP Books. Now I can build a functionally decent Q-jet, but why bother when I can put it in the immensely capable hands of Henry Kunz from B&B Auto Machine/Gas Flow Techniques (GFT) in Lynbrook NY. People who race competitively in the NHRA Stock eliminator classes MUST use a stock carb, often a Q-jet & they send them to him from all over the country. Henry IS the MAN! Find him here . . . . . And for the book . . here . . I think that Holley 4bbls are great on WOT drag car apps, but other than their simplicity for tuning ease at the drag strip, they are a good SECOND choice behind the properly functioning Q-jet. I have some experience with setting up both brands of carb in both extremes of usage. For excellent pulling power and part throttle fuel efficiency on pump gas street engines, especially in heavy cars with lower compression & taller gears, stick with the Rochester Quadra-Jet.
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