quadrajet vs. edelbrock - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ol yellow 72 · 12-31-2010, 02:46 PM

ok guys ive done some research via google and would like ur porfessional advise now

i recently changed my quadrajet out for a new 600 edelbrock, and i lost almost 8 mpg.

everything im reading says the quadrajet should be more fuel efficent then the edelbrock due to the quad being spreadbore.

so should i hunt down another quadrejet and junk the edelbrock?
any of you guys have any advise eather way?

bmchevy1979 · 12-31-2010, 03:01 PM

I would say go back to the quadrajet because if you get it set up right it will be a very good setup

83burban · 12-31-2010, 03:15 PM

my stock 83 suburban with a CCC Quadrajet got 22 MPG average on one of my cross country driving trips. I was drafting Semi's a lot of the time, so that definitely helped, but I usually average 14 to 15 with normal highway cruising

Malo83 · 12-31-2010, 03:18 PM

Quote:

Originally Posted by bmchevy1979

I would say go back to the quadrajet because if you get it set up right it will be a very good setup

X2

Restrorob · 12-31-2010, 04:03 PM

Quote:

Originally Posted by bmchevy1979

I would say go back to the quadrajet because if you get it set up right it will be a very good setup

X3

.

Chevydude56 · 01-01-2011, 12:39 AM

Quote:

Originally Posted by ol yellow 72

ok guys ive done some research via google and would like ur porfessional advise now

i recently changed my quadrajet out for a new 600 edelbrock, and i lost almost 8 mpg.

everything im reading says the quadrajet should be more fuel efficent then the edelbrock due to the quad being spreadbore.

so should i hunt down another quadrejet and junk the edelbrock?
any of you guys have any advise eather way?

Why did you remove the q-jet? was there a problem with it?

Tim240Z · 01-01-2011, 01:07 AM

Sorry to hijack the thread:
I have an edelbrock on my 460 BBC in my Burb, and have been considering swapping to a QJet....does anyone have any experience with the Summit Racing rebuild units, the universal ones set up for BB?

http://www.summitracing.com/parts/SUM-210210/

Thanks,
Tim

**oldgold70c10** · 01-01-2011, 02:04 AM

I have never dealt with a remaned q-jet, but I've read and heard a lot of bad things. Your best bet would be to rebuild it yourself. Get Cliff Ruggle's book and study it before starting. Really, they are not as complex or difficult to work on as everyone makes them out to be. A big problem with them is worn throttle shaft holes, but it really isn't that expensive to have new bushings installed ($8-$20).

Tim240Z · 01-01-2011, 03:22 AM

Quote:

Originally Posted by oldgold70c10

I have never dealt with a remaned q-jet, but I've read and heard a lot of bad things. Your best bet would be to rebuild it yourself. Get Cliff Ruggle's book and study it before starting. Really, they are not as complex or difficult to work on as everyone makes them out to be. A big problem with them is worn throttle shaft holes, but it really isn't that expensive to have new bushings installed ($8-$20).

The thing is, I don't have one now.....

Shyguy · 01-01-2011, 11:17 AM

Used Qjets should be pretty plentiful since a lot of people replace them. Try posting on Craigslist.

Check the sale section on this forum also, someone may have one for sale.

ol yellow 72 · 01-01-2011, 12:23 PM

i removed the old quad because it wouldnt idle, and didnt run so great, and my friend gave me this headache, i mean edelbrock, and like a dummy i gave the quad away

*Ticker* · 01-01-2011, 01:31 PM

The simple answer is that Q-jets are great carbs; the spread bore, unique construction and huge flow capacity makes them one of the best street carbs of all time.

The downside is that they're typically in lousy shape, and there are very few rebuilders that can do them right. Tuning parts and expertise are also tough to come by.

Your Edelbrock is fine - it just needs some tuning as it doesn't come tuned "out of the box".

ol yellow 72 · 01-02-2011, 01:03 AM

got a nice quadrejet today, bolted it on and GLADELY throwed the edelbrock into the scrap pile to take to the crusher.

Goldfinger · 01-12-2011, 02:34 PM

It took some work but I am getting better economy with an edelbrock. you just have to tune it down.

Tx Firefighter · 01-12-2011, 02:57 PM

Quote:

Originally Posted by ol yellow 72

got a nice quadrejet today, bolted it on and GLADELY throwed the edelbrock into the scrap pile to take to the crusher.

Insanity.

They are damn good carbs. Something was surely wrong with yours to lose 8mpg versus a quadrajet. I'm not saying they're better than a quadrajet, but yours had something else very wrong with it. I'll take every Edelbrock or Carter AFB I can get. They are the easiest carb around to overhaul and mine have always worked very well.

prostreetC-10 · 01-12-2011, 03:30 PM

Q-jet or Edelbrock???

Dang.......that's like asking two "short" school buses to race each other!

(LOL...did I just type that?)

heeroyue2002 · 01-12-2011, 04:13 PM

Quote:

Originally Posted by ol yellow 72

got a nice quadrejet today, bolted it on and GLADELY throwed the edelbrock into the scrap pile to take to the crusher.

how much to ship it this way?

64GMCHorsepower · 01-12-2011, 07:25 PM

Quote:

Originally Posted by ol yellow 72

got a nice quadrejet today, bolted it on and GLADELY throwed the edelbrock into the scrap pile to take to the crusher.

Tell me you did not throw a NEW carb away!?! I have one and it runs great, you just need the kit from Summit that has the springs and metering rods to adjust it to your application.

If you did, I'll pay shipping and you can send it to me....

12-31-2010, 02:46 PM	#1
ol yellow 72 Registered User Join Date: Aug 2005 Location: kentucky Posts: 210	quadrajet vs. edelbrock ok guys ive done some research via google and would like ur porfessional advise now i recently changed my quadrajet out for a new 600 edelbrock, and i lost almost 8 mpg. everything im reading says the quadrajet should be more fuel efficent then the edelbrock due to the quad being spreadbore. so should i hunt down another quadrejet and junk the edelbrock? any of you guys have any advise eather way?

12-31-2010, 03:01 PM	#2
bmchevy1979 Registered User Join Date: Dec 2010 Location: Visalia, Ca Posts: 707	Re: quadrajet vs. edelbrock I would say go back to the quadrajet because if you get it set up right it will be a very good setup __________________ <Brandon> 1974 Chevrolet K5 Blazer 350sbc/SM465/NP205, dana44 front, corp 14bolt rear with 4.10s and a powertrax locker, custom rear bumper 400sbc in the works. 1981 GMC C1500 stepside 250i6, 3spd, 12bolt with 3.08s 2.5/4drop on 15x10 with 275/50r15 81 GMC C3500 cab-chassis dually with utility bed 350sbc, Sm465, 14bolt with 4.10s nv4500 getting ready to go in 1979 Chevrolet K5 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434096 1976 Chevrolet C10 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434195

12-31-2010, 03:15 PM	#3
83burban Registered User Join Date: Feb 2008 Location: la Posts: 345	Re: quadrajet vs. edelbrock my stock 83 suburban with a CCC Quadrajet got 22 MPG average on one of my cross country driving trips. I was drafting Semi's a lot of the time, so that definitely helped, but I usually average 14 to 15 with normal highway cruising

01-01-2011, 01:07 AM	#7
Tim240Z Senior Member Join Date: Jan 2005 Location: LAX area, So Cal Posts: 499	Re: quadrajet vs. edelbrock Sorry to hijack the thread: I have an edelbrock on my 460 BBC in my Burb, and have been considering swapping to a QJet....does anyone have any experience with the Summit Racing rebuild units, the universal ones set up for BB? http://www.summitracing.com/parts/SUM-210210/ Thanks, Tim __________________ 1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005)

01-01-2011, 02:04 AM	#8
oldgold70c10 Who's got steelies? Join Date: Feb 2006 Location: Morrison, Oklahoma Posts: 1,025	Re: quadrajet vs. edelbrock I have never dealt with a remaned q-jet, but I've read and heard a lot of bad things. Your best bet would be to rebuild it yourself. Get Cliff Ruggle's book and study it before starting. Really, they are not as complex or difficult to work on as everyone makes them out to be. A big problem with them is worn throttle shaft holes, but it really isn't that expensive to have new bushings installed ($8-$20). __________________ 1969 C10 LWB W/ 250 I6 & 3spd 1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver. 1975 Chevelle Malibu Classic Coupe 350/th350 mint green 1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel

01-01-2011, 11:17 AM	#10
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: quadrajet vs. edelbrock Used Qjets should be pretty plentiful since a lot of people replace them. Try posting on Craigslist. Check the sale section on this forum also, someone may have one for sale. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

01-01-2011, 12:23 PM	#11
ol yellow 72 Registered User Join Date: Aug 2005 Location: kentucky Posts: 210	Re: quadrajet vs. edelbrock i removed the old quad because it wouldnt idle, and didnt run so great, and my friend gave me this headache, i mean edelbrock, and like a dummy i gave the quad away

01-01-2011, 01:31 PM	#12
Ticker Account Suspended Join Date: Oct 2009 Location: Sammamish, WA Posts: 2,404	Re: quadrajet vs. edelbrock The simple answer is that Q-jets are great carbs; the spread bore, unique construction and huge flow capacity makes them one of the best street carbs of all time. The downside is that they're typically in lousy shape, and there are very few rebuilders that can do them right. Tuning parts and expertise are also tough to come by. Your Edelbrock is fine - it just needs some tuning as it doesn't come tuned "out of the box". Last edited by Ticker; 01-12-2011 at 03:03 PM.

01-02-2011, 01:03 AM	#13
ol yellow 72 Registered User Join Date: Aug 2005 Location: kentucky Posts: 210	Re: quadrajet vs. edelbrock got a nice quadrejet today, bolted it on and GLADELY throwed the edelbrock into the scrap pile to take to the crusher.

01-12-2011, 02:34 PM	#14
Goldfinger Registered User Join Date: May 2010 Location: laurel hill Fl Posts: 645	Re: quadrajet vs. edelbrock It took some work but I am getting better economy with an edelbrock. you just have to tune it down. __________________ 1985 C10 Custom Deluxe LWB 305/700r4 [ Goldfinger ] 1999 k3500 crew cab dually 6.5tdi/4l80e

01-12-2011, 03:30 PM	#16
prostreetC-10 My Carbon Footprint Join Date: Oct 2008 Location: Orygun Posts: 5,527	Re: quadrajet vs. edelbrock Q-jet or Edelbrock??? Dang.......that's like asking two "short" school buses to race each other! (LOL...did I just type that?) __________________ A quick "pedalfest" *Still getting loose (carb test)* 496 Initial fire up video! Last edited by prostreetC-10; 01-12-2011 at 03:31 PM. Reason: ricky bobby can't spell worth a hoot!



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