Posted By: 70 Roadrunner*
Carb selection for mild 383 4-spd 3:54 rear end - 06/23/13 08:47 PM
I've just rebuilt my 383 in my 70RR and am looking at getting a new carb.The engine is running a Comp Cams hydraulic flat tappet XE274H...488/491 valve lift.It's an air grabber car so I went with the Edelbrock DP4b intake.It's bored .030 over,flat-top pistons and stock HP exhaust manifolds through an entire 2 1/2 mandrel bent system.It's a 4-spd with 3:54 gears and I was thinking along the lines of a Holley 750 double pumper or a Quick Fuel HR series 750...anyone with any experience along these lines?
I'm a novice at this so if I missed something take that in mind...I was figuring a 750 DP would be good.I'm planning on TTI headers down the road...any help would be great,thanks
Dave
Posted By: dogdays
Re: Carb selection for mild 383 4-spd 3:54 rear end - 06/23/13 09:07 PM
Holley Street Avenger 770.
Or Edelbrock 800, either AFB or AVS.
Quadrajet or Tquad
R.
Posted By: gch
Re: Carb selection for mild 383 4-spd 3:54 rear end - 06/24/13 12:56 AM
It doesn't need any more than a 750.What kind??That is up to you.I really like the Holley HP series.I have a couple of the older ones and they have been great.I also have a plain old 3310 vacuum secondary with a milled choke horn and a metering block kit in the rear that has been flawless for 20 years and run on everything from a 350 to a 427BBC to my 496 stroker.
The bottom line is what ever you get you will have to tune it some to get the best drive ability out of it.I had screw in air bleeds put in mine and the tuned on a dyno so I know the fuel curve is spot on.
Your car will run fine with a DP or a vac secondary.The choice is up to you.I still favor vacuum secondary carbs that are street driven more than not.They feel crisper and if the secondary spring is correct you have no performance loss IMO.You can get away with a slightly larger carb this way also without it stumbling around at part throttle in a higher gear.
Posted By: RapidRobert
Re: Carb selection for mild 383 4-spd 3:54 rear end - 06/24/13 03:55 PM
You said mild 383 & street driven. As said several good ways to go. A correctly functioning OE thermoquad, one with 1&1/2" primaries (850 CFM). Several of the Eddies except for the infamous #1407 750. If a holley then one of the clones with the adjustable circuits
Posted By: JohnH
Re: Carb selection for mild 383 4-spd 3:54 rear end - 06/24/13 09:31 PM
No more holley's for me, Go Edelbrock
Posted By: wunderless
Re: Carb selection for mild 383 4-spd 3:54 rear end - 06/24/13 11:44 PM
Thanks! Seems to be mostly at cruise and start up.
Float is the next thing I'm looking at. I'm just starting to learn as about carbs as I always found them daunting and mystifying.
Posted By: 68LAR
Re: Carb selection for mild 383 4-spd 3:54 rear end - 06/25/13 02:52 AM
MY
750 - 800cfm "Q" series Quick fuel. Definitly has to be a double pumper with a stick car.
Posted By: 70 Roadrunner*
Re: Carb selection for mild 383 4-spd 3:54 rear end - 06/25/13 05:58 PM
Guys thanks for helping out this rookie with all your info.From what I gather it's a Holley or Quick Fuel DP carb and tune it as I go along.Both those carbs appear to have the most room for adjustments,etc.Thanks again for all the input...
Dave
Posted By: terzmo
Re: Carb selection for mild 383 4-spd 3:54 rear end - 06/25/13 06:03 PM
proform...alot of features...750 dual feed/double pump
