Going from a 2bbl to a 4bbl on a 383

Derek Simpson

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Hey guys,

Looking for some advice on doing a upgrade, I have a 66 Newport with a 383.
I want to swap out the 2bbl to a 4bbl, so I'm looking for some advice on what should I get.

Thank you
Derek
 
I have an Edlebrock AVS carb sitting on top of an high rise Edlebrock aluminum intake manifold. Dont know if that set up will clear your slab car hood. You might want to think about changing the cam if your looking for serious performance upgrade.
 
I would love to swap the can out too but I have to get the needed stuff done first. The original 2bbl carb needs a rebuild, so instead of throwing good money at it might as well upgrade lol. Also I need new tires and rims all the way around because the guy put these dinky rims on the front to lower it lol. Also I need to take care of a few soft spots on the body.

So a cam one day lol
 
I would love to swap the can out too but I have to get the needed stuff done first. The original 2bbl carb needs a rebuild, so instead of throwing good money at it might as well upgrade lol. Also I need new tires and rims all the way around because the guy put these dinky rims on the front to lower it lol. Also I need to take care of a few soft spots on the body.

So a cam one day lol
Ah...gotcha then. Guess if that 2bbl is acting up its time to deep six it along with the heavy cast iron intake its sitting on (but keep the parts once you make the swap). Best to take care of the "need" stuff first...then the "want" stuff second. Its too bad though cause your gonna have to take that new intake off once your ready to do the camshaft...but its all a labor of love.
 
Hey guys,

Looking for some advice on doing a upgrade, I have a 66 Newport with a 383.
I want to swap out the 2bbl to a 4bbl, so I'm looking for some advice on what should I get.

Thank you
Derek

Does the car have dual exhaust ? The addition of a 4-barrel is gonna require the engine to breath better. Also, I'm not sure, but I think the factory cam on both the two-barrel and four barrel 383 motors is the same (someone please correct me, if I'm wrong). As far parts go, I would recommend an Edelbrock dual plane manifold and one of their 1406 four-barrel carburetors.

Edit: Just checked the parts catalog: The cams for a 2-barrel and 4-barrel are different, but you should still get a performance improvement with the new intake, carb and dual exhaust.
 
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Yeah the need before the want is hard sometimes lol

It definitely is a labor of love, I just can't wait to go cruising
 
Does the car have dual exhaust ? The addition of a 4-barrel is gonna require the engine to breath better. Also, I'm not sure, but I think the factory cam on both the two-barrel and four barrel 383 motors is the same (someone please correct me, if I'm wrong). As far parts go, I would recommend an Edelbrock dual plane manifold and one of their 1406 four-barrel carburetors.

I'll be upgrading to dual exhaust , it needs it! Lol
 
Hey guys,

Looking for some advice on doing a upgrade, I have a 66 Newport with a 383.
I want to swap out the 2bbl to a 4bbl, so I'm looking for some advice on what should I get.

Thank you
Derek
my 72 dodge has a 360 on it and the previous owner put a 4bbl carb on it. it was a carter AFB competition series. i recommend (because of the cam) an edelbrock model 1400, 600 CFM carb, because thats the current setup i have now and it runs beautifully
 
My 383 started life as a 2bbl also. I run a Holley 1850 (600 cfm) and edelbrock performer rpm intake and dual exhaust. Im very happy with the setup. Can lay a passenger side tire track all day long :)

Edelbrock makes a performer 383 that will give you a little more oomf off the line, but the performer rpm seems to really shine on the top end.

The performer rpm sits up about another inch or so... It's a tight fit, but works in my fury.

I plan to do a cam swap, move up to a 750 cfm carb and sure-grip with 3.23 gears once the bank account recharges.

Edit - I still have the performer 383 intake out in the garage if you are interested. Been meaning to sell it for a while. Pm me if you want pics
 
Poking around my new to me Fury I was curious exactly what carb was on my 440. I knew it was an Edelbrock but didn't know the model. It has a 1406. I looked up the specs and was very surprised to see it was only 600 cfm. I did alittle internet research on carb sizing of different displacement engines. Went from hot rod guys to big block RV guys. What I got out of it was basically how fast will you run your engine? For me at the moment I doubt I will go much higher than 5500 rpm. Looking at some math posted on the forums the 600 cfm should be adequate on a 440 with very good throttle response etc. From what I read if you are going to be wringing it out on a 440 above 6000 rpms 600 cfm carb will become a restriction. Correct me if I am misinformed. But in any case my stock 440 seems to like the Edelbrock 1406 600 cfm just fine so a 383 should have no problems I would think.
 
Performer intake and a Edelbrock 1406 carb. It has an electric choke and will run perfect right out of the box. Numerous people have tried that combo with outstanding results.
 
Poking around my new to me Fury I was curious exactly what carb was on my 440. I knew it was an Edelbrock but didn't know the model. It has a 1406. I looked up the specs and was very surprised to see it was only 600 cfm. I did alittle internet research on carb sizing of different displacement engines. Went from hot rod guys to big block RV guys. What I got out of it was basically how fast will you run your engine? For me at the moment I doubt I will go much higher than 5500 rpm. Looking at some math posted on the forums the 600 cfm should be adequate on a 440 with very good throttle response etc. From what I read if you are going to be wringing it out on a 440 above 6000 rpms 600 cfm carb will become a restriction. Correct me if I am misinformed. But in any case my stock 440 seems to like the Edelbrock 1406 600 cfm just fine so a 383 should have no problems I would think.

The Eddie 1406 is plenty of carb for all stock B and RB engines.
 
The Eddie 1406 is plenty of carb for all stock B and RB engines.

Thanks for confirming that. I had to sift through a lot of BS on some other forums saying 750 cfm Minimum on a 440 etc and the RV guys were much more rational about the subject as they were after torque at lower rpms to pull their rigs,,which is basically what I am after with a big Fury. I'm not pulling anything with the car but I am lugging around a big Fury with the 440.
 
My 383 started life as a 2bbl also. I run a Holley 1850 (600 cfm) and edelbrock performer rpm intake and dual exhaust. Im very happy with the setup. Can lay a passenger side tire track all day long :)

Edelbrock makes a performer 383 that will give you a little more oomf off the line, but the performer rpm seems to really shine on the top end.

The performer rpm sits up about another inch or so... It's a tight fit, but works in my fury.

I plan to do a cam swap, move up to a 750 cfm carb and sure-grip with 3.23 gears once the bank account recharges.

Edit - I still have the performer 383 intake out in the garage if you are interested. Been meaning to sell it for a while. Pm me if you want pics

Just sent you a PM
 
I don't want to rain on anyones parade but if need takes priority before want, then consider what the cost of a rebuild kit for a 2bbl carb will be. If the butterfly shaft in the carb is good with next to no side wobble (forward and back) then that may be a consideration for the short term until you get more money together and get the soft spots taken care of in the body. (About $25) After all, the 2bbl is no slouch and is great for cruising and is good on economy. Once you are ready to spend a bit of real money on the car then you can do the cam and manifold etc all at once. Lastly regarding the carb size, don't bother with the really big carbs, it is just unburnt fuel going out your exhaust most times. If you are not planning on going more than 120mph then it isn't necessary.
 
im about to do this , this very evening in fact. from a 383 2bbl to 4bbl with new intake.

i had an oil leak / seep out of the back side of the valley pan, so i put on a new pan felpro 1214, and decided to upgrade while i had the stock intake off. it is freaking heavy BTW.

i had the offy 2x4 quad intake w/ 2 edelbrock 600s.. i tried to put it on the car, and had it on there bolted down, and it was going to take so much modification to the throttle linkage and kickdown linkage, that i punted.

so i got a wieand action plus intake,, its getting delivered today. it will have an edelbrock 600 on top.

ill let you know how it goes :)

- saylor
 
i just did this a few months ago with an edelbrock 600 cfm and a weiand dual plane intake. I have been having ignition problems so hard to tell just how good the set up is but for the little bit I have driven her this year she has felt good with the new set up.
 
I simply plopped the 1406 onto the stock manifold on my 440. It comes tuned more suitably for a basically stock engine than the 750 cfm.
Runs like new.
 
Poking around my new to me Fury I was curious exactly what carb was on my 440. I knew it was an Edelbrock but didn't know the model. It has a 1406. I looked up the specs and was very surprised to see it was only 600 cfm. I did alittle internet research on carb sizing of different displacement engines. Went from hot rod guys to big block RV guys. What I got out of it was basically how fast will you run your engine? For me at the moment I doubt I will go much higher than 5500 rpm. Looking at some math posted on the forums the 600 cfm should be adequate on a 440 with very good throttle response etc. From what I read if you are going to be wringing it out on a 440 above 6000 rpms 600 cfm carb will become a restriction. Correct me if I am misinformed. But in any case my stock 440 seems to like the Edelbrock 1406 600 cfm just fine so a 383 should have no problems I would think.

In '68 the 440 in my NYer came factory with a 625 Holley.

I don't want to rain on anyones parade but if need takes priority before want, then consider what the cost of a rebuild kit for a 2bbl carb will be. If the butterfly shaft in the carb is good with next to no side wobble (forward and back) then that may be a consideration for the short term until you get more money together and get the soft spots taken care of in the body. (About $25) After all, the 2bbl is no slouch and is great for cruising and is good on economy. Once you are ready to spend a bit of real money on the car then you can do the cam and manifold etc all at once. Lastly regarding the carb size, don't bother with the really big carbs, it is just unburnt fuel going out your exhaust most times. If you are not planning on going more than 120mph then it isn't necessary.

I'm with Gary here. If the carb isn't worn out I'd put a rebuild kit in it. I knew a guy with a 383 in a '68 Newport Convertible that only had a 2bbl, it shocked me how that car ran.
 
there is a dyno test somewhere and the 2bbl pulls better for the first couple of licks, then the 4bbl wins the rest of the way. but ya nothin wrong at all with a 2bbl that is running right.
 
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