What carburetor would be best?

[Adam]

Okay....It's time to start building a motor to go with my swiss cheese.

I have a '68 383, will probably be 0.060" over by the time it cleans up, with a MP 509 cam, stock electronic ignition with an accesl or similar coil, undecided on heads as of yet, Schumacher headers, with a 4-speed, 10.5" clutch, 3.91 sure-grip, probably 255/60R15 rear tires in a '76 Dart Sport.

This will be a street car and more than likely my daily driver during the summer months. So nothing too too wild is really an option. I'd rather lose a little performance for the sake of economy and driveability, so I'd prefer vacuum secondaries.

What intake and carb do you guys think would be ideal for my situation? Bearing in mind that I suck at tuning carburetors 

[Crazy68Dart]

Not an engine builder here, but this is probably what I would do...  Get the "new" .509 grind with more street friendly specs.  For heads, probably the best bang for the buck in your situation would be a warmed up set of stock heads, RPMS, or the Stealth heads.  Carb, well, for a street bruiser you can't go wrong with the Eddy carb, maybe a 750 AVS.  However a Holley or Demon will work too.  You'll get different opinions there.  Intake, Performer RPM is probably what I would choose as it produces nice street characteristics.  You may want to re-evaluate your rear gearing with those tires for a daily driver.

[sunsetdart]

Go with a 750 Holley for the combo you want to use. That should be enough carb for that set-up. The Holleys are very tuning friendly and if you're still not sure get a Hooley manual or go to thier website at Holley.com.

[sycboi]

Either get a Demon 750 or QuickFuel 750 with mechanical secondaries for both.  I have used both with great results.  A slightly built quick revving 383 with a 4-speed will appreciate the capabilities of a 750 mechanical secondary carb. 

Oh, and a Performer RPM intake hands down!


-Michael

[guzzimike]

What intake and carb do you guys think would be ideal for my situation? Bearing in mind that I suck at tuning carburetors 

 

I have a similar situation as you.

'69 383 (.060), Performer RPM manifold, H306 Chet Herbert cam: (Dur 224 @.050/Lft .459/108 LS), 902 heads (ported, polished), SureGrip 3.91 SG/727 AT, 2800 RPM stall TC, Schumacher headers, MSD6AL ingnition/coil/ distributor, 255-60R/15 BFG.

Street only car, daily driver and I am clueless about Carb tunning.

So I used a Edelbrock 750 for about a year and now run a 800 cfm ( AVS Thunder Carb with adjustable secondaries and electric choke) It's flawless for the street and if I'm extremely gentle on the throttle I get between 16 - 19 MPG City driving.

It's a respectable enough Street Hooligan..

[73swinger]

I ran a 700cfm Edelbrock on my 383(before she blew up) and liked it alot. I didn't have to do anything to it. I've since given it to my Dad for his 327 4-speed 55Chevy. He just bolted it on and loves it. I don't think they are the best for an ALL OUT engine but are very well mannered for a street car. I'm currently running an 850 Mighty demon on my 496......loves the gas

[jyrki]

As far as teh carb goes, I would go a different route. I would not buy any "universal" carb. Instead, I would contact some carburetor shop, and ask them to build me a holley based carburator calibrated for my combination. If you choose this way, I guarantee you will thank yourself later for the decission. I have used for example this builder with great success: http://www.chucknuytten.com/pro_street.htm

[jamesdart]

if you arent going to hit the track stay away from the mechanical secondaries. especially if you are just going to run regular radials on the back.  750 holley with vac secondaries are pretty easy to tune, but i think if you will see no track time you would probably be best with an eddy carb with a performer rpm intake.  might even consider a smaller cam if you wont be hitting the track much.  the more i think about it and my dart sits in he garage in pieces, the crazy fuel prices, i dont think ill be hitting the track the way i used to so i really dont see the ned for much more than a stock big block. i think some major detuning might be in the works.

[Crazy68Dart]

if you arent going to hit the track stay away from the mechanical secondaries. especially if you are just going to run regular radials on the back.  750 holley with vac secondaries are pretty easy to tune, but i think if you will see no track time you would probably be best with an eddy carb with a performer rpm intake.  might even consider a smaller cam if you wont be hitting the track much.  the more i think about it and my dart sits in he garage in pieces, the crazy fuel prices, i dont think ill be hitting the track the way i used to so i really dont see the ned for much more than a stock big block. i think some major detuning might be in the works.

I am right there with ya, hence my recommendations.  The Eddy carbs are pretty painless as far as drop on and go, tweak if things don't work right.  Ditto on the detuing, high hp on the street has sort of lost its appeal at these prices... 

[ksdartguy]

Id say the eddy for ease of it all and lack of tuning experience.
The kit for them will allow some easy metering rod changes to improve mileage.
If you want to do that later.
Rick

[sycboi]

A QuickFuel with mechanical secondaries on a 4-speed street car will absolutely shock you if you haven't driven one.  In a good way I mean.  Just cruising along or really getting on it they perform flawlessly.  They have so many part number variations that you can order up that tuning out of the box will be almost absent.

-Michael

[rharveysr]

Holleys are very tuning friendly

  Reallty dont know where that came from....If you like adjusting and adjusting and then when the weather changes...adjusting again..Holley is the carb you want. Cruise on over to Diamondbackracing.com and check out the combination that a number of guys use..
 Rickey's car will be running a pair of 500 cfm Edelbrocks on his tunnel ram...Set'm and for get'm

Rick

[ucdcrush]

With that size cam you'll probably run into idle issues without some serious tuning, and some carbs are easier to get to work than others-- e.g. mighty demons or holley HP which have changeable air bleeds, idle feed restrictors and such. I think the edelbrock avs thunder says it's good for cams up to 250 duration @ .050" which the 509 is larger, im not saying you couldn't get it to work but on a 383 especially, it may take quite a bit of tuning if you use a carb not intended for that wild of a cam with low vacuum..