What size carb is everyone running on their 383

-
C

chargers777

Well-Known Member
Joined
Apr 21, 2007
Messages
139
Reaction score
15
I have a750 Holley vs,a summit racing 750vs and a Holley 600. All need rebuilt. It's going on a 67 383 with Schumacher headers. No strip action just gonna be a street cruiser.
 
I would opt for the 750 vs Holley. I used to run Holley 3310 on my 383. You can run the electric choke kit for better warm up in colder climates.
 
I had a 71 Road Runner years ago with the factory 600cfm Holley & it ran real good. No need to run too much carb a pretty mild 383. If you can find a Thermoquad & tune it correctly (Air door opening for secondaries etc.) they work really well & they are 800 to 850cfm. They used them on some 318s even. A very misunderstood carb that is great for the street. IMO
 
I ran a 750 cfm AVS from a HP 440 on mine. I also ran a 72 TQ (800 cfm) from a 400. Both ran great. I would skip the 600 cfm.
 
Last edited:
I currently have a holley spread bore 650 vacuum secondary on my smogger 400. Any one of your carbs will work.Pick the one you like the best (or needs the least amount of work) and have at it.
 
chargers777 said:
I have a750 Holley vs,a summit racing 750vs and a Holley 600. All need rebuilt. It's going on a 67 383 with Schumacher headers. No strip action just gonna be a street cruiser.
Click to expand...
If you look at the carb size recommendation website a near stock 383 needs just a little more than 500 CFM so any of what you have would be fine. Personally, I've had both Holley and Edelbrock carbs and the later AVS2 carbs with annular primary boosters provide superior throttle response. An AVS2 650 would be perfect for your application.
 
On the street; with street-friendly gears, and street tires,
it hardly matters, especially with an automatic
because;
Top of Second gear is gonna be around 85mph@5500
At 65 still in Second, with 3.23s, at WOT, your rpm is gonna be about 4100, which mathematically, means a 500 is more than the engine needs.
Your engine, will only pull whatever it needs thru the carb, NOT what the carb is rated at. So whether your carb is a 600 or a 1000, if all your 383 is able to pull is 455, then that's what it's gonna pull thru either carb.
Having said that, the bigger the primaries are, the less snappy the throttle response will be at the lower rpms, especially as the cylinder pressure drops.
For you
If I had the choice, I would go with a spreadbore, and then it don't much matter what you run, as long as it is at least equal to what the carb-formula spits out, which in your case is 455cfm at 4100@100% efficiency, or 555@5000@100% efficiency..... more like 470@ 85%
Now
if you have a big cam that is still making power at 6750, that would be a 750, and I'd go with a double pumper, cuz I'd be pushing 190psi cylinder pressure, or more, and when I nail it, I'm expecting gobs of tirespin....... but maybe that's just me, lol.

but, one more thing I gotta say, I tried a 600VS Holley on my 367, and it sucked bigtime. So I reworked it for fuel-economy, and in that mode, it does pretty good. But, I wouldn't ever recommend that Holley-carb for any V8, except maybe a Chevy, lol.

At age almost 72 now, I'll probably never again run anything but a DP.
If I want less tirespin, I know how to Not floor it and I don't need a vacuum pot to help me on the street. I learned real quick that tirespin was a sick thing to play with.
But, if fuel-economy is on the Table, sometimes, with a DP carb, the secondaries do open too early, and that usually costs you mpgs. Like for merging into traffic or for passing. Say you need 250 hp for what you want to do, and the primaries could easily do that. But with a DP, you cannot get 100% primaries at 0% secondaries, cuz the secondaries begin opening maybe at 60/70 percent, and I always streetjet the secondaries a lil fat. Thus, when I dial in 250 hp, my secondaries will be flowing fat, and costing me mpgs, compared to say an AV secondary, set-up for these kinds of situations, especially say, a spreadbore.
If your engine makes plenty of low-rpm vacuum, I would also go so far as to recommend a metering rod type carb. But don't put that thing on a 292 cam, lol. But that thing will work great on a factory 2bbl cam. Which I guess, is one of the reasons why a Thermoquad was such a great option. It had everything a streeter could ever want, including the oh-so-intimidating, roar of sudden-defeat.
Yeah so, I use that carb whenever I have the option.
 
Last edited:
It depends on the carburetor TYPE. A 750 DP for example, will be somewhat fat on a mild 383. But if it's one that's tuneable with replaceable IFRs and PVRs and air bleeds, you can tune the crap out of it so it'll run like it's on fire. An older 4779 requires some pretty extensive mods to get to the same place. The old 3310 is a great carburetor, but might be too fat on the idle circuit and those are not adjustable from the factory, but can be modified. If you want "bolt on and go" I'd recommend an Edelbrock 650 AVS. Thermquads are great, but have a learning with both building and especially tuning. The new little 625 Street Demon 3 barrel carburetors are really nice. I have the 750 version on the 400 in my Ford truck and it runs very well.
 
Last edited:
Ran a 750 DP Holley from the late 70's to what seems A long time! However since 2014 the Eddy AVS 850 has been running Damn stout on the 69 Fish! Very Simple Tune and the Motor Loves the
Carb! Easy tuning compared to the Holley DP! JMO!
 
chargers777 said:
I have a750 Holley vs,a summit racing 750vs and a Holley 600. All need rebuilt. It's going on a 67 383 with Schumacher headers. No strip action just gonna be a street cruiser.
Click to expand...

For what it’s worth, the 383 did come from the factory with a small 600 Carter.

If this is a true driver with no real expectations of to fast with the exception of getting on the interstate and passing on the Hwy. The 600 will do fine with excellent throttle response.

I think the entire MoPar brother hood knows the 750 was a well known and liked improvement. I daily drive my 5.9-360 Magnum with a 750 Edelbrock. It’s does has 3.55 out back, FWIW.

A taller geared car (2.76-2.96) will like the smaller carb better.
 
if any of those 750's have the down leg boosters, that's the one I'd run.
 

furz4 said:
I would opt for the 750 vs Holley. I used to run Holley 3310 on my 383. You can run the electric choke kit for better warm up in colder climates.
Click to expand...
I just picked up a 3310 Holley, reading a Holley sheet on it, they said was designed for a Chevy 396, and they are 780 cfm , looking forward to building it , good morning :thumbsup:
 
memike said:
I just picked up a 3310 Holley, reading a Holley sheet on it, they said was designed for a Chevy 396, and they are 780 cfm , looking forward to building it , good morning :thumbsup:
Click to expand...
The old 780's were a great carb. They had 2 metering blocks and down leg boosters if I remember correctly. Unfortunately, the "3310's" of today have one metering block and straight leg boosters.
 
RustyRatRod said:
Man were they ever a great carburetor for mild big blocks! Just perfect!
Click to expand...
Thank you Rusty, that's the word I am getting also, I might pick your brain and bend you ear some when I pull it off the shelf, just picked it up Thursday off FB Market place, a good old guy that said he pulled it off a 67 big block Ford fair lane, i asked him if he had pictures, we had a good time looking at his hot rodes, his sons has all of them except his 68 Mustang, beuity of a car White on white all stock except rear gear. The Fairlane will go to his sons as soon as he gets off the river boat
 
You must log in or register to reply here.
-
Back
Top Bottom