IMHO you already have it on the engine. Have the QJ professionally rebuilt at the same cost of a new Holley or Eddie carb.

 

My vote would be contact Cliff Ruggles, and have him build a QJet to exactly match your combo of engine, trans and rear gears. He can also do an electric choke, if that's what you'd prefer.

 

Ditto to Cliff, he is great with QuadraJets!

Stay with the QJet for everyday driving.

 

the fi tech system is the best do away with carb runs great.

 

What are your plans for the car? Why are you wanting to change? Tell us this and the answers will be more tailored to your goals.

 

A ton of us on our site have had Mountain Man build their carbs and have had fabulous service. He also builds it to the application. :satisfied:

 

Qjet is the most underrated carb,stick with it.

 

AMEN to that ! All things new are not necessarily better !:usa:

 

This is a pretty neat website for us Quad lovers !
http://www.chevyhardcore.com/tech-stories/choose-your-quadrajet-number-identification-guide/

 

..you know, picking out a carb. is like choosing a good beer, there all tasty, and they quench your thirst. Myself, I love the Q-jet that's on my big boy,once there set up, they can run circles around the competition.but, I too been looking at carbs lately and I'm leaning towards "Holley" ..everybody's got those "Eddy" carbs, there ok, but for a big block,yea,go holley if you're going change out carbs..:beer::alc:

 

I have looked up my carb and the numbers indicate a 1980 chev 4 barrell automatic. The second row of numbers on the carb are 0570 CPM and I can't find anywhere what they mean. I think it has to do with the choke maybe .Anyone got any ideas ?

 

0570 is the date of manufacture. 57th day of 1980.
CPM is an internal plant code.

 

For normal driving around town my truck runs pretty good but to me smells a little rich at times. However, if you floor it and open the secondaries it stumbles a little before it gets going. I just want good overall throttle response for my basically stock motor.
RTT Todd

 

For normal driving around town my truck runs pretty good but to me smells a little rich at times.


I'd rather be rich than lean for best overall engine operation. What do your spark plugs look like on the white internal electrode porcelain? A light tan to light chocolate color works best for me.

Rick

Sent from my SAMSUNG-SM-N900A using Tapatalk

 

If you drive it often I would highly recommend FiTech. More expensive than a carb or carb rebuild, but runs amazing.

 

What’s your fuel pressure

 

Like the others have said you already have the best carb..

Pull the vacuum hose off the secondary diaphragm and peen the end of the tubing closed a little more.. That's how you adjust a Quadrajet secondary flapper, leave the spring alone as long as it pulls the flapper shut gently..

 

Peening the end of the tube ?? Is that some new way of tuning ? Why not pull it off, send it to Mtn Man and let them set it up for your application . That way you know when you get it back its correctly done.

 

Hi Todd,
I have the same 396/402 in my 70 Elkie. A rebuild is OK if you want to stay all stock. Make sure you get someone well known to do the rebuild.

Since my 70 is not stock, I went with the Holley 4150 Aluminum Street Avenger 670 cfm. I got it from Summit Racing. They talked me into the larger 770 cfm at first but it was way too big for my engine. That is when I changed to the 670 cfm.
It works great starts every time. I just hit the gas one time and it cranks right up.
Bill Elkie

 

I am sure these other people do quality work on carbs,BUT, you have so many VERY happy people on this site that have had Mountain Man Carbs and Injection do their work ! It is very hard to ignore the fact that all of these people are happy with their work. He will match up what you need .atriot:

 

Could not agree with Wayne more. Mountain Man rebuilt my carb to my driving habits. At 250,000 miles of flawless use.. it is now time for another trip to Arkansas so Ted can work his magic.. they can't be beat.

 

Another vote here for the qjet. Getting things cleaned up a bit and in shape will be best bet.

 

I like the 800 Quadrajet with electric choke.
flyinhoss:lookround:

 

in my opinion, the Qjet is the best street/performance carb ever devised...I'm not at all a Holley fan. the running rich or stumbling can be cured by a good carb man.

that said, if I were ever going to change, there's no doubt in my mind I would go with FiTech. I now know 3 people who have made the move, I have driven all 3 before and after - the improvement is enough to make me consider doing it on my Elky.

 

I have a 750 Holley on my Malibu 408 engine. It likes gas really well, but runs great. The Caddy engine in my Elco has the stock/ modified by me, 800 Q-jet w/electric choke. Those small primary venturis are what give decent mileage & street manners..

 

Have Mountain Man carbs rebuild your Quad. Bolt it on and forget it.:cool2::cool2:

 

Amen again 1

 

I'm with the pack. Q jet all the way. Been building engines since '85, and they are the best overall. Holley, so so, floats collapse often, and not friendly to climate changes. Edelbrock, pretty good. A close friend and gear head swears by Carter, if you can get the older ones since they have made choke changes. If you have those issues, it may not necessarily be the carb. Many variables to tuning. Just my two cents.....