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8/26/12 5:29pm - Original Message: 'Carb...'
Mynewold75vette
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San Antonio, TX - USA

Vette(s):
Little on the rough side right now, with new paint and new interior it will be looking fine!

Joined: 8/18/2012
Posts: 53
I know that the carburetor on this 75vette i bought needs to be rebuilt, but what i am also wondering if it is a very good carb and if i should upgrade it to something beefier.  here are some pics!





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I hope to one day be as knowledgeable as most the guys on here... but till then I'll have to just keep asking the questions with the obvious answers....
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8/26/12 6:20pm - Reply: 'Re: Carb...'
Adams' Apple Lifetime Member
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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
Posts: 19449
That's an Edlebrock "copy" of the old Carter AFB carb. They're pretty good carbs, for the most part, and fairly easy to set-up/tune, compared to Holleys.

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Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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8/26/12 6:40pm - Reply: 'Re: Carb...'
Mynewold75vette
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San Antonio, TX - USA

Vette(s):
Little on the rough side right now, with new paint and new interior it will be looking fine!

Joined: 8/18/2012
Posts: 53
any idea as to where i can find a rebuild kit for that carb?

____________________________________

I hope to one day be as knowledgeable as most the guys on here... but till then I'll have to just keep asking the questions with the obvious answers....
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8/26/12 10:52pm - Reply: 'Re: Carb...'
Adams' Apple Lifetime Member
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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
Posts: 19449
Any parts house should have them...those carbs are pretty popular. Napa, PepGurls, AutoZone, etc.....
There is a series of numbers on the base, lower passenger side. Write those numbers down and call your local parts place, and see if they have the kit in stock.


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Joel Adams
C3VR Lifetime Member #56    
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             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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8/27/12 12:21am - Reply: 'Re: Carb...'
Mynewold75vette
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San Antonio, TX - USA

Vette(s):
Little on the rough side right now, with new paint and new interior it will be looking fine!

Joined: 8/18/2012
Posts: 53
So i'm half intimidated after looking up the parts number and the info for this carb (thanks for telling me where to find the number) i am wondering if i should really attempt to try to rebuild it myself with a kit or have a mechanic rebuild it for me, it is an Edelbrock 1407 carb and its been something like 3 years since this car has really been run well.  I have the time to do it but i don't know if i have the expertise...  i sadly feel like i'm lacking more and more of that each day that own this car...

|UPDATED|8/26/2012 9:21:55 PM (AZT)|/UPDATED|


____________________________________

I hope to one day be as knowledgeable as most the guys on here... but till then I'll have to just keep asking the questions with the obvious answers....
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8/27/12 1:56am - Reply: 'Re: Carb...'
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 830
Jon, I'd tend to concur with you on carbs - most of the time in the past when I've messed with 'em it hasn't turned out well.  BUT - good news here - I've recently had a pretty good experience rebuilding an Edelbrock copy of a Q-jet, the OEM carb for our cars.  (Edelbrock is good at copying already good designs).  My recommendation if you build it yourself: get yourself a really good, recommended book for the Edelbrock/Carter AFB and follow it closely.  Don't skimp on recommended procedures and cleaning, if you don't have the required tools, buy 'em or borrow 'em, don't try to make do, and just go really slow and spend some time.  The internet (including this site) is also a valuable tool.  

I'll use this opportunity to put a plug in for the Q-jet (Rochester Quadrajet).  They have a bad rap with many folks, but they actually are a pretty good carb if they're set up right, especially if you aren't trying to get 450 HP and just a want a good, streetable (and relatively good fuel economy compared to something like a Holley).  If you don't mind switching carbs, a Q-jet might be a good way to go.  If you are interested then buy this book:


You might also want to buy this one since it has a lot of good pictures and info about various rebuilding procedures:


Cliff's book will tell you exactly what to look for when picking up a good, serviceable core, and what models would suit your application.  They are very easy to find, just search on your local Craigslist for "Q-jet" and I bet you'll find some for fairly cheap.  If not, swap meets or e-bay.  That book will also walk you through the rebuild process and tell you how to fix/improve a lot of things along the way.  Cliff also sells the rebuild kits that have the proper rubber parts for today's ethanol gas.  Finally he has a great forum pretty much solely dedicated to Q-jets here that has a ton of info on it.  


Hope this is at least a little helpful.  Sorry for spouting off about Q-jets - I'm just pleased I got mine to run and run right without a lot of tedious tuning.  Good luck.  




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1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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9/7/12 9:53am - Reply: 'Re: Carb...'
Case75
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
I have much the same Edelbrock on my '75 except mine is the 1411 which has an electric choke. I've had good luck with it. I'd have rather had the 1426 650 cfm though as I think the 750 cfm is too big.

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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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9/7/12 11:56am - Reply: 'Re: Carb...'
Sarge81 Lifetime Member
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WEST SENECA, NY - USA

Vette(s):
1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.

Joined: 12/3/2001
Posts: 2376
Edelbrock square bore carbs are a fairly simple design. Like Adam said its a copy of the old Carter AFB carb. I had one years ago on my '79 Chevy K10. They are simple to rebuild. I had to open up mine to install the offroad springs for the floats. Once I did that I never had to mess with it again.

Rochester Q-jets are also a very good and much maligned carb as mentioned by "daveo76." I've been running a Q-jet on my vette for years with no real issues. I did try the Q-Jet made by Edelbrock when they first came out. It was much better than the Holley Street Avenger I tried. The only problem with a Edelbrock Q-Jet is that they use truck metering rods. Truck metering rods will cause a lean condition at wide open throttle at high rpms. Not good for pistons. I found this out when my Air/Fuel ratio went super lean during a dyno run. Also spoke with a guy named Lar's who was the carb guru on the other forums. He informed me of the truck rods in Edelbrock Q-Jets.

Not trying to take away from the info "daveo76" posted but merely add another option.
I had SMI "Sean Murphy Induction" www.smicarburetor.com build me a Q-jet specific for my car. He was very thorough wanting to know various details about the car to set it up correctly. They did an awesome job. Car runs strong with no issues.

Good luck!




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GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.
3.54 Dana 44
'69 "N11" Sidepipes
Borgeson Steering Box
Born 8/1981
Sequence #3975




Click here to see more pics of my Vette on CarDomain.


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9/7/12 3:22pm - Reply: 'Re: Carb...'
dskopp
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Oak Creek, WI - USA

Vette(s):
1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

Joined: 5/21/2008
Posts: 1956
Welcome to the group, Jon.  Feel free to ask as many questions as you can think of, lots of help here!!!
Dan


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9/7/12 8:37pm - Reply: 'Re: Carb...'
Mynewold75vette
Former Member
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San Antonio, TX - USA

Vette(s):
Little on the rough side right now, with new paint and new interior it will be looking fine!

Joined: 8/18/2012
Posts: 53
Thanks Dan!  and yeah i will be asking LOTS of questions! i have alot of issues to work out with this vette!  on the bright side i managed to do a great job of getting that carb rebuilt! thanks everyone!

____________________________________

I hope to one day be as knowledgeable as most the guys on here... but till then I'll have to just keep asking the questions with the obvious answers....
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9/8/12 1:57am - Reply: 'Re: Carb...'
daveo76
Standard Member
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 830
Sarge, I bought my rebuild kit from Cliff's High Performance - when I called I personally talked with Cliff himself and he spent about 10-15 minutes with me.  I described my engine specs and what I was going to do with the car and he suggested a different set of secondary metering rods and was able to include them (for a reasonable price) with the rebuild kit.  Through that discussion he felt that the primary jets and rods that came with the carb were appropriate so I didn't need to buy replacements for those.  So far I haven't been able to test out the secondaries a whole lot since I'm still breaking in the motor, but the low speed drivability is excellent so I think he was spot on for the primary side.  Q-jets are very tune-able if you're willing to change rods and jets since so many GM cars used them for widely different applications and there were tons of different varieties.  You just have to know which to use and where to get them.

Oh, and I agree, Lars Grimsrud is an excellent source of info in regards to Q-jets, ignition timing and advance curves and general info about 'Vettes and other GM cars.  Just search for him on the net and any number of informative papers will pop up.  


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1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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9/11/12 4:30pm - Reply: 'Re: Carb...'
73shark
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Overland Park, KS - USA

Vette(s):
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.

Joined: 7/9/2003
Posts: 381
First thing I'd do is to replace the hose from the fuel pump to the carb w/ a steel line.  There's a very good reason that they came that way from the factory.  Corvettes burn very well.  Cry

If you don't want to do the steel line, at least replace the rubber hose w/ a high pressure hose designed for fuel injection cars.  Thumbs Up

All of the suggested sources are very good.  The Q-jet is relatively easy to rebuild even tho it might seem a little daunting at the start.  Just get either or both of the suggested books and you should be able to do it.  Good luck.  Beer


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1973 L-82 4 spd

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