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#1 |
Registered User
Join Date: May 2014
Location: Mission BC
Posts: 452
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4 barrel Carb question
1972 k10 350/350. Currently has a quadrajet 4 barrel and runs ok.
Truck has 33x9.5 x15 skinnies and gets about 14mpg. I plan to keep the 350 as its recently (1500 mile) rebuilt and add a 700r4. Should I keep the quadrajet or switch to an edelbrock? Had an edelbrock on my 304 CJ and was quite happy with it...or should I go right to TBI?
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1962 C10 Longbox LS 5.3 4L60E----Sold$$ 2014 Ram 4x4 3500 Laramie Diesel..Momma's truck 2015 Ram 4x4 1500 1997 Boxster. 1972 K10 Custom Deluxe LS 6.0 1950 GMC 3100 S10 & LS swapped |
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#2 |
Registered User
Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,191
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Re: 4 barrel Carb question
Keep the Quadrajet until you have the means to install a TBI system. I would steer away from the Edelbrock, especially if your Quad is currently working good for you, which it sounds like it is.
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#3 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: 4 barrel Carb question
If you've got a Q-Jet and it's running well, they run (almost) as nicely as EFI when properly calibrated, so enjoy and ignore! I wouldn't poke that dog with a stick, as they say...
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#4 |
Registered User
Join Date: May 2016
Location: Ohio
Posts: 274
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Re: 4 barrel Carb question
What has you saying it runs ok versus the Edelbrock running good on the Jeep?
I've always liked the quadrajets better than the Edelbrock's for mostly stock applications (drivability) and a Holley or derivative for high performance applications.
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1972 K10 1986 K30 crew cab dually 2002 Z06 2007 Escalade |
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#5 |
Registered User
Join Date: Mar 2013
Location: Campbellsville, KY
Posts: 888
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Re: 4 barrel Carb question
Yep, if your Q-jet is in good tune keep it. About the only thing an Edelbrock or Holley do better than a Q-jet is pour fuel in mass - and the Quadrajet is no slouch at that if the secondaries are working right. They are rated at 750-800 CFM, after all.
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Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue. |
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#6 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,922
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Re: 4 barrel Carb question
Quadrajet. I would spend money on a quality remanufactured Quadrajet before I'd buy a new Edelbrock. And I've owned and worked on Edelbrock, Carter, Weber, Holley (and Motorcraft).
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#7 |
Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Re: 4 barrel Carb question
Please pardon the piggyback here, but this thread is very timely for an issue I'm having with an Edelbrock (1904) version of the Quadrajet on a '71 350 ci.. It simply started overflowing/flooding at idle and two good dismantle/check/adjust efforts have failed to fix - made it worse actually - fuel now coming out the vent. I'm going to rebuild it with a new kit, but in the meantime am thinking about buying a replacement.
What vendor (online?) do you recommend for purchase of a rebuilt Q'jet - who has the best product/guarantee? I am thinking of going to the later version (1980s) with electric choke, assuming it comes calibrated for the older SB350. Would like to retain the same fuel inlet/filter arragement. Do you see any possible problems there? Thanks for any info/advice.
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CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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#8 |
Registered User
Join Date: May 2016
Location: Pa
Posts: 1,278
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Re: 4 barrel Carb question
http://www.customrebuiltcarbs.com
Really good people and I'm sure Phil has the right # for your truck in stock Just my .02
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IT IS WHAT IT IS |
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#9 | |
Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Re: 4 barrel Carb question
Quote:
Any other reccs folks?
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CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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#10 |
Registered User
Join Date: Jul 2015
Location: Central Coast, CA
Posts: 500
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Re: 4 barrel Carb question
Sorry to spoil the party; but I have to offer my own opinion for those willing to stray from the OEM path and that is for the Quickfuel Slayer 600 CFM Vacuum Secondary four barrel. SL-600-VS
It is about $318 complete from Summit or Jegs or maybe even Quickfuel direct http://www.quickfueltechnology.com/c...600cfm-vs.html The vacuum secondary makes it very forgiving and somewhat self-adjusting compared to say a 750 CFM mechanical secondary Holley with the fiddly four corner idle mixture settings. It is all aluminum (instead of weaker zinc) has the clear sight windows for setting the floats; all parts are available individually and at a reasonable price; full rebuild kits are cheap, and the killer app is their vacuum secondary rate is adjustable with a screwdriver - just 1/8th turn of a screw and it is like swapping out a spring on the Holleys and clones.. |
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#11 |
Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Re: 4 barrel Carb question
Thanks Gromit - this is interesting. Went to their site and couldn't find much detailed info on overall bore setup and choke type - maybe I didn't seek very well. Do you know if it is square or spread bore and if it comes with electric choke?
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CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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#12 |
Registered User
Join Date: Jul 2015
Location: Central Coast, CA
Posts: 500
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Re: 4 barrel Carb question
It is square bore, and I do have a spreadbore manifold but I found I needed a carb spacer anyway to have clearance for the vacuum hose to my brake booster and PCV vacuum hoses.
So I used a Mr. Gasket spacer that also functions as a spread bore to square bore adaptor with the SL-600-VS carburetor. The adaptor was $32 from Oreilly's (photo attached). Item # MRG 1932 QuickFuel and Edelbrock and Moroso also sell similar ones. Yes, it has an electric choke - just one wire to run to the fuse block "Ignition Unfused" terminal (key on power) - I used an in-line fuse - $3.00 from Oreillys. Mine worked out of the box with no choke adjustment necessary. Last edited by Gromit; 08-13-2016 at 03:28 PM. Reason: added item number for adaptor |
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#13 |
Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Re: 4 barrel Carb question
Thanks, Gromit.
__________________
CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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#14 | |
Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
|
Re: 4 barrel Carb question
Quote:
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CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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#15 |
Registered User
Join Date: Feb 2011
Location: Modesto, CA
Posts: 2,188
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Re: 4 barrel Carb question
I think everyone above pretty well covered the topic, but to lend my opinion-
The Edelbrock carb in and of itself is negligible as to how much fuel it would save you over a well tuned Quadrajet, or how much performance it could offer. For every post I've seen where someone says they saved fuel, I've seen one where people claim it was a waste of money. I have an Eddy 1406 on my crate 350, backed by a 700r4, and i'm certainly not sipping gas. The Edelbrock isn't just a bolt on carb for most people. It is very sensitive to fuel pressure, usually requiring a regulator or an Edelbrock fuel pump that can consistently put out pressures below 6psi. Also, they are sensitive to heat and can experience carb boil/vapor lock issues, so often they need an insulator gasket and/or a phenolic carb spacer. So that $xxx.xx priced Edelbrock carb often needs to be coupled with new fuel lines, pump, and carb spacer. The Quadrajet however, can be rebuilt for under the base price of the Edelbrock, and still offer equivalent performance and fuel economy. I think it's important to note that once you factor in the cost of the entire transmission swap and whatever carb or fuel delivery system you choose, you'll have to put thousands of miles on your truck, just to break even on the amount of fuel you'll save. With an OD transmission, You'll only start to save gas in 4th gear. Being super generous and optimistic, you may gain 5-7mpg over an equally tuned vehicle not using overdrive, using hyperdrive characteristics. That's A LOT of 4th gear driving mileage to recooperate the cost of the transmission and fuel delivery system. The swaps you are considering are best justified for personal enjoyment, and the benefits of going EFI over carb (ease of starting, elevation driving etc.) Best of luck with your decision! ![]() Last edited by leftybass209; 08-15-2016 at 01:53 PM. |
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