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10-19-2004, 06:31 PM
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#1 |
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Rollin' Member
Join Date: May 2003
Location: Hayward, California
Posts: 240
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Before I click checkout – carb questions
Hey all,
I am on the fence on buying a new carb. I am looking at the stage 2 quadrajet (http://store.summitracing.com/defaul...rt=JET%2D36002) I am wondering if this will be a simple bolt on affair. I have a stock 350 in my 77 C10 that probably still has the original carb on it. I know that changing a carb is not rocket science, and I am confident that by taking the old one off I will have a good understanding of how to put the new one on but, am I missing anything obvious here? Is there anything else that I should be ordering at the same time to make sure this works? My truck is my primary vehicle so I cannot really afford downtime. My goal is to improve my throttle response and also improve my mileage a tad while I am at it. Also would there be any substantial difference in my mileage if I went with a stage 1 as opposed to a stage 2? Thanks -
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:: 1977 C10 cheyenne :: :: 1973 new yorker brougham :: for sale - $1,500 lofat productions |
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10-19-2004, 07:02 PM
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#2 |
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Led Sled! Discs R 4 ME!
 
Join Date: Jan 2001
Location: Toms River, NJ, USA (Transplanted Hoosier)
Posts: 7,327
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What carb is on your truck now?
Also check to see that the q-jets Throttle Linkage will connect. |
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10-19-2004, 07:07 PM
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#3 |
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Led Sled! Discs R 4 ME!
Join Date: Jan 2001
Location: Toms River, NJ, USA (Transplanted Hoosier)
Posts: 7,327
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Also with a stock 350 you may find the stage 2 is jetted a little rich.
The stage 2 is set up for a mild cam. It should work and you may be happy with it but you may also get "bog" when you tromp on it. Also consider the stage one. Last edited by DennyB; 10-19-2004 at 07:08 PM. Reason: DennyB's typing stinks |
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10-19-2004, 07:18 PM
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#4 |
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Rollin' Member
Join Date: May 2003
Location: Hayward, California
Posts: 240
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Thanks for the reply –
Yeah – I was also looking at the stage 1 too. I think I saw someone (prolly with a mild cam) talking up the stage 2 and I just book marked that page. I hear good things about them though. The carb on my truck right now is the stock (so far as I know) Q-jet.
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:: 1977 C10 cheyenne :: :: 1973 new yorker brougham :: for sale - $1,500 lofat productions |
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10-19-2004, 07:33 PM
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#5 |
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Led Sled! Discs R 4 ME!
Join Date: Jan 2001
Location: Toms River, NJ, USA (Transplanted Hoosier)
Posts: 7,327
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I'm not real sure how a '77 is set up as far as emissions are concerned.
IE: air pumps, etc.. It the trucks were excempt from these requirements in '77 the stage 2 might be some fun. If you want to play it safe, get a stage 1. It is tuned for a stock engine. Also talk to summit's tech department with these issues. They can be very helpful. And if they recommend a stage 2 and it does not work then you have better odds of swapping it back for a stage 1. |
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10-19-2004, 07:42 PM
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#6 |
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Registered User
Join Date: Apr 2002
Location: Katy, Texas
Posts: 171
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Whoa Whoa
forget the q-jet, save a buck and buy a Holley street avenger. A carter(edelbrock) is cheaper even than that and would probably require less tuning still. A street avenger has potential for MUCH better throttle response and mileage but if you have limited knowledge and access to knowledge the carter would probably a better option, cheaper, essentially no tuning (idle screws only). The Q-jet should be a direct replacement though. Holley and Edelbrock might require some linkage modification and vacuum re-routing.
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10-19-2004, 07:42 PM
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#7 |
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Rollin' Member
Join Date: May 2003
Location: Hayward, California
Posts: 240
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Right on - Thanks for the help.
Quick question - What is the difference between the 750 CFM and the 800 CFM? ... besides 50 CFM. I always assumed that was how big they were - Why are the 800's cheaper than the 750's across the board?
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:: 1977 C10 cheyenne :: :: 1973 new yorker brougham :: for sale - $1,500 lofat productions |
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10-19-2004, 07:48 PM
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#8 |
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Registered User
Join Date: Nov 2003
Location: st. louis area
Posts: 1,551
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nothin wrong with Holley, or Edelbrock/Carter for that matter( although I prefer Holley), but a properly prepared Qjet will sing & run with the best of em, & potentially give better MPG. I say go for the Q-jet.
Course, who am I to talk , Ive got a 770 Holley on mine LOL
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75 GMC C-15 short/step factory 454, lowered |
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10-19-2004, 08:04 PM
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#9 |
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Rollin' Member
Join Date: May 2003
Location: Hayward, California
Posts: 240
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well - I ordered my stage 1.
 Wish I did it yesterday - woulda had it for the weekend. =/ I got another couple years before I can put the headers on it - so no point in putting the cart before the horse with the stage 2. Thanks again for the help. Cheers, Scott
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:: 1977 C10 cheyenne :: :: 1973 new yorker brougham :: for sale - $1,500 lofat productions |
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10-19-2004, 08:07 PM
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#10 |
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Registered User
Join Date: Oct 2004
Location: Sacramento CA.
Posts: 8
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www.quadrajetcarbs.com (I five Components) Go check out these guys. I talked to them mon. and you can get a rebuilt 800 cfm legal quadrajet for $260 with no core exchange. If you want to send them your core later on theyll give you $30 for it
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10-19-2004, 08:09 PM
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#11 | |
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Led Sled! Discs R 4 ME!
Join Date: Jan 2001
Location: Toms River, NJ, USA (Transplanted Hoosier)
Posts: 7,327
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Lets not get into a "This carb is better than that carb" on this post.
Quote:
A quadrajet is a combination of mechanical and vacuum operated secondarys - best of both worlds for a mild to hot street engine and would make the perfect replacement for an old quadrajet. hmmm, Can you tell I'm a quadrajet guy
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10-19-2004, 08:11 PM
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#12 | |
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Led Sled! Discs R 4 ME!
Join Date: Jan 2001
Location: Toms River, NJ, USA (Transplanted Hoosier)
Posts: 7,327
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Quote:
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10-19-2004, 08:15 PM
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#13 |
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Registered User
Join Date: Oct 2004
Location: Sacramento CA.
Posts: 8
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Ive never had a quad. before, but lately Ive read nothing but positive articles on them and so ive decided to stick with it, instead of the $450 edelbroc.
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10-19-2004, 08:53 PM
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#14 |
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Registered User
Join Date: Sep 2003
Location: Lewisville, NC
Posts: 1,836
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I have a rebuilt Q-Jet but the primaries are lean I believe, no power from it at all. I didn't feel like messing it with it and bought me a holley 4160 and have been quite pleased with it so far, all I have done so far is change the secondary spring, jetted it from 64s to 62s and tuned the idle mixture and it seems perfect. I still think I need to change the secondary spring though, doesn't feel just right, but doesn't bog other than for the fact I have 3.42 gears and 33" tires, once I get some 4.56 gears though we'll see what happens.
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1985 Scottsdale Shortbed 4x4 Stout 350 with some "upgrades"-700r4-33x12.5" Mud Tires, Warn 8274-50 winch. 2005 Chevrolet Colorado Regular Cab 2wd 4-banger, 5 speed, Street Pack with 3.73 axle. |
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10-19-2004, 11:50 PM
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#15 |
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Garage Queen Material
Join Date: Oct 2002
Location: USA
Posts: 4,129
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i had a stage2 qjet on my engine when i first had it running. i didnt like it. ran really crappy, i think the stage3 would have been a much better choice. that and i was having to run an adapter plate/1" spacer for it
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10-20-2004, 11:37 AM
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#16 |
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Rollin' Member
Join Date: May 2003
Location: Hayward, California
Posts: 240
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Curioius - what purpose do spacers serve?
Damn BB4 - wish I saw that link yesterday.
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:: 1977 C10 cheyenne :: :: 1973 new yorker brougham :: for sale - $1,500 lofat productions |
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10-20-2004, 12:34 PM
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#17 |
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Led Sled! Discs R 4 ME!
Join Date: Jan 2001
Location: Toms River, NJ, USA (Transplanted Hoosier)
Posts: 7,327
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[QUOTE=lofat]Curioius - what purpose do spacers serve?
...QUOTE] THe spacers serve 2 purposes. 1) to adapt a spread bore carb to a square bore manifold (or vice versa). 2) Composite spacers also reduce heat from the manifold from being transfered to the carb. Hence a cooler intake charge = more power. |
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10-21-2004, 12:56 AM
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#18 |
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Registered User
Join Date: Apr 2002
Location: Katy, Texas
Posts: 171
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Spacers also increase velocity of air/fuel mixture (plenum velocity) because they accelerate through gravity longer. Power towers and tunnel rams are examples of systems that have exploited this effect to greater extents.
As far as carbs go I like simple and elegant. I dont know any old racers running q-jets for anything but nostalgia. The simplicity of a holley makes it ideal for racing use. Because it has been so widely used in racing there is a lot of knowledge and overall availibility of holley stuff (Demon carbs, Barry Grant and others have significantly refined holleys). I took apart one q-jet and a bunch of ball bearings fell out (canned it). Took apart another thinkin i was gonna do this one right. Went by the book and did but it leaked through the butterfly rods. A new q-jet will bolt on and run untoched on a stock motor for longer than any other carb. Adjusting for other motors is nearly rocket science but will gain you MUCH respect if you can do it successfully. edelbrock... well... yeah... |
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10-21-2004, 04:54 PM
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#19 | |
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Rollin' Member
Join Date: May 2003
Location: Hayward, California
Posts: 240
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Well, it looks like I will have an opportunity to get my carb elsewhere afterall -- peep this:
I got an email today from Summit - blank body with a word attatchment (almost deleted it w/o looking as I don't open attatchments from people whom I don't know) and they tell me they need to verify my shipping information. I sent back a reply stating that if it hadn't shipped yet just cancel the order. Then I get an email that just says "SCOTT" and one hour later this - Quote:
So much for their same or next day shipping. I'll just order from someone else when the pending authorization on my credit card for the $350.00 falls off.... and save a few bucks while i am at it.
__________________
:: 1977 C10 cheyenne :: :: 1973 new yorker brougham :: for sale - $1,500 lofat productions |
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10-21-2004, 05:52 PM
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#20 |
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Led Sled! Discs R 4 ME!
Join Date: Jan 2001
Location: Toms River, NJ, USA (Transplanted Hoosier)
Posts: 7,327
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Wow, A problem with summit!
I have ordered thousands of dollars worth of stuff from them over the years and if there was a problem, it was corrected post-haste. I uasually receive my stuff on the 2nd or 3rd day with their standard free shipping. Perhaps talk to them and tell them the other price you got. They may match it. They did that for me with a painless wireing harness and I got free shipping to boot. I told them I got a price of bla bla from who who, provided a phone number and they matched it. How much is shipping with the other company? I have always had only the best service from them. Denny |
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10-21-2004, 06:34 PM
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#21 |
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Rollin' Member
Join Date: May 2003
Location: Hayward, California
Posts: 240
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That's what I always heard from others too - ah well. I am going to call those I Five cats and see what's up.
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:: 1977 C10 cheyenne :: :: 1973 new yorker brougham :: for sale - $1,500 lofat productions |
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10-21-2004, 07:02 PM
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#22 |
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Rollin' Member
Join Date: May 2003
Location: Hayward, California
Posts: 240
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Now that couldn't have been any easier. It's nice to talk with a human who knows his stuff rather than to some cat looking just in a book.
I feel so much better about giving my support to the smaller shops too. Thanks BB4, for that lead and everyone, for their help!
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:: 1977 C10 cheyenne :: :: 1973 new yorker brougham :: for sale - $1,500 lofat productions |
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10-21-2004, 07:47 PM
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#23 | |
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www.loweredd.com
Join Date: Aug 2002
Location: Struble IA
Posts: 808
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Quote:
 It's only up to 20 lbs, and they charge 9.95! It pisses me off when people call up and piss and moan about thier 65 lb box that cost $18 to ship, when Summit would have shipped for free. Sorry to hijack and rant, but I couldnt help it.  
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10-21-2004, 08:08 PM
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#24 |
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Registered User
Join Date: Oct 2004
Location: Sacramento CA.
Posts: 8
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Glad to see you get some good help from Ifive. If you go thru the internet by way of Yahoo and do a search under quadrajet, you'll get a lot of good writeups on quadrajets and working on them, even how to modify them for more power and some of the problems to be aware of. Good luck Lofat
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10-22-2004, 11:32 AM
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#25 | |
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Led Sled! Discs R 4 ME!
Join Date: Jan 2001
Location: Toms River, NJ, USA (Transplanted Hoosier)
Posts: 7,327
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Quote:
I don't pay for shipping and get it in 2 or 3 days. How is that bad? I will agree that the extra $9.95 for second day air is not worth it since half the time I get it on the second day anyway with the free shipping. BB4XDUALLY, Great link you posted! 
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