Time for a new carb. Advice?

[SlinktRR]

Just use some rubber lines for now to move the car into the garage, you should be able to buy a few feet at your local parts store. You can buy a roll of aluminium fuel line for probably $30 and then make your own very easily over the winter.

Agreed. Just hook it up with auto zone rubber hose and clamps. Over the winter you can do 6AN braided or hard lines, plenty of videos on how to do both.

 

[68BabyBlue]

I run a Holley 770 street avenger on my 383. Absolute love it.

I ran the same on Baby Blue the second time I owned the car. Ran the stock Carter AVS the first time around. Bob Miller, who owned the car before me, tweaked the daylights out of it, and it performed better than most, had the time cards to prove it. He was amazed at the improvement when he drove the car again 30 years later. Drove the car to Carlisle just about every one of the last eight years I owned it, and it always ran perfectly. The current owner loves the street avenger as well, no plans to change it. Stock 440 GTX is this case, so not a perfect apples to apples comparison.

 

[Houle #382]

My 1970 383 (3:91 gearing 4 speed) doesn't have a lot of service history other than oil changes, filters and timing changes. What I do know is around 20K miles ago and the notes say "Complete engine rebuild. Hardened valve seats. Rings. Bearings etc." no mention of cam upgrade. Came with a M1 dual plane intake manifold and Holley Double Pumper 4777-2 with an electric choke. Later added a spacer ( Holley 108-12) for vapor lock.

That carb is toast.

Nearby I have these options on Marketplace:

Edelbrock AVS2 800CFM

Holley 850 Double Pumper #76850BK (probably too big)


I hear the AVS2 is a very good carb for my needs. There are some other options within 50 miles of Hastings, MN on Marketplace like this:

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but those two seemed the best. Thoughts?

The 650 AVS 2 is a perfect carb for your 383, I'm running the 650 AVS2 on a mild built 440 Four speed car. Engine has aluminum heads hydraulic roller cam Edelbrock performer RPM intake the 650 AVS2 and stock exhaust manifolds. Out of the box performance is fantastic bolt it on set your idle and air mixture screws and go. You will be really surprised at the light to light Excelleration

 

[DynaBro]

Just use some rubber lines for now to move the car into the garage, you should be able to buy a few feet at your local parts store. You can buy a roll of aluminium fuel line for probably $30 and then make your own very easily over the winter.

Yep that's the plan for today. Just do the bare minimum to get things moving once the adapter arrives and focus on getting the truck repaired in the meantime. Again. Modern coolant systems are ridiculously problematic and Fords are plastic Mexican crap.

The 650 AVS 2 is a perfect carb for your 383, I'm running the 650 AVS2 on a mild built 440 Four speed car. Engine has aluminum heads hydraulic roller cam Edelbrock performer RPM intake the 650 AVS2 and stock exhaust manifolds. Out of the box performance is fantastic bolt it on set your idle and air mixture screws and go. You will be really surprised at the light to light Excelleration

The air screws aren't set from the factory? Not that it's difficult or anything but that's surprising. Glad to hear this carb works really well for everyone and is popular. I did manage to finagle a killer deal on it. I don't like where all the hoses run compared to the Holley though, all crowded up going in the front like that.

Agreed. Just hook it up with auto zone rubber hose and clamps. Over the winter you can do 6AN braided or hard lines, plenty of videos on how to do both.

Yeah and it will be a fun process when it isn't a race against time.

 

[Houle #382]

running 2 800 avs2 on both 440 engines. 1 on a RT and 1 on a Newport. they are a lot better than the 750 AVS for low end power and throttle responses. the 800 cfm will start making more power over the 650 cfm after about 4500 rpms. you need to know what rpm range you like to run.

I tried both AVS 2's, the 650 first then the 800 on my 68 RT 4 speed mild built 440 and the 650 performed so much better than the 800 I sold the 800. Bottom end all the way through top end the 650 pulled harder than the 800. I made a couple of changes to the 650, one I changed the springs from the factory orange to the Pink Springs and changed the secondary jets from 98's to 104's huge difference these were the only 2 changes I made and haven't touched it since. The 800 seemed to run good on top but not nearly as good as the 650 on bottom end. Excelleration with the 650 was way better than the 800. Talking with a Edelbrock tech before I bought both carbs, he said for a streetcar you can't beat the 650. If it's a street and strip car the 800 might pick up a tenth in the 1/4 mile, I had to try both I guess it's a Mopar thing, anyway for the street the 650 for me was the way to go.

 

[gtxrt]

I tried both AVS 2's, the 650 first then the 800 on my 68 RT 4 speed mild built 440 and the 650 performed so much better than the 800 I sold the 800. Bottom end all the way through top end the 650 pulled harder than the 800. I made a couple of changes to the 650, one I changed the springs from the factory orange to the Pink Springs and changed the secondary jets from 98's to 104's huge difference these were the only 2 changes I made and haven't touched it since. The 800 seemed to run good on top but not nearly as good as the 650 on bottom end. Excelleration with the 650 was way better than the 800. Talking with a Edelbrock tech before I bought both carbs, he said for a streetcar you can't beat the 650. If it's a street and strip car the 800 might pick up a tenth in the 1/4 mile, I had to try both I guess it's a Mopar thing, anyway for the street the 650 for me was the way to go.

sorry I have to politely disagree. no loss of bottom end even in my 67 4400 lb Newport with a rpm performer intake and a sure grip 2.94 gear ratio the big whale will go sideways off the line. both my RT and Newport had 750 cfm Edelbrock carbs on before I put the 800 avs2 on them. they now have better low end throttle responses and low end power. on the high rpms really didn't pick up much power with the 800 cfm. not sure what your set up is what camshaft, timing set at etc etc.

 

[DynaBro]

I tried both AVS 2's, the 650 first then the 800 on my 68 RT 4 speed mild built 440 and the 650 performed so much better than the 800 I sold the 800. Bottom end all the way through top end the 650 pulled harder than the 800. I made a couple of changes to the 650, one I changed the springs from the factory orange to the Pink Springs and changed the secondary jets from 98's to 104's huge difference these were the only 2 changes I made and haven't touched it since. The 800 seemed to run good on top but not nearly as good as the 650 on bottom end. Excelleration with the 650 was way better than the 800. Talking with a Edelbrock tech before I bought both carbs, he said for a streetcar you can't beat the 650. If it's a street and strip car the 800 might pick up a tenth in the 1/4 mile, I had to try both I guess it's a Mopar thing, anyway for the street the 650 for me was the way to go.

Sounds like I'll be satisfied with the 650. Sadly there's really not much left of the track culture that I'm aware of, and thanks to the cat ladies Nefring the world for "safety" there's a 4 way stop every 1/4 mile even in the boonies so you don't have a lot of opportunity to really dig into top end performance anyway. A nice, reliable carb with good low end will be sufficient for me.

 

[Houle #382]

Sounds like I'll be satisfied with the 650. Sadly there's really not much left of the track culture that I'm aware of, and thanks to the cat ladies Nefring the world for "safety" there's a 4 way stop every 1/4 mile even in the boonies so you don't have a lot of opportunity to really dig into top end performance anyway. A nice, reliable carb with good low end will be sufficient for me.

You will be very satisfied with the 650 AVS2, it's a great carb. Have to remember it's much easier to over carb than under carb.

 

[Houle #382]

sorry I have to politely disagree. no loss of bottom end even in my 67 4400 lb Newport with a rpm performer intake and a sure grip 2.94 gear ratio the big whale will go sideways off the line. both my RT and Newport had 750 cfm Edelbrock carbs on before I put the 800 avs2 on them. they now have better low end throttle responses and low end power. on the high rpms really didn't pick up much power with the 800 cfm. not sure what your set up is what camshaft, timing set at etc etc.

The 650 has smaller Ventures than the 800 which gives a quicker Excelleration than the 800. Don't get me wrong the 800 is a great carb but the 650 is better for the street which I have already proven to a few guys with basically the same engine but with bigger carbs. For one the engine won't run as rich at idle as the 800 does. I tried jetting it down and changing rods and jets and it just didn't like it. My hydraulic roller is a 600 lift intake 584 Exhaust with 235/250 duration. Timing is 14 degrees initial 36 total at 2500rpm. I'm running the stock exhaust with a 2 1/2 inch H pipe into 3 inch Dynomax Super Turbo mufflers with 3 inch tail pipes and tips. My RT runs very good with this setup. What works for one guy might not work for the next. Mopar to you !!

 

[Cranky]

Show us your dyno, runs using all three choices, or flow velocity calcs, rather than "I'm sure the 800CFM AVS will be fine"....based on what?? A seat of the pants guesstimate? What if it it isn't correct?...are you willing to buy the wrong carb for the OP?? We're talking Mopar...not GM...again, no real figures....just guesstimate on what someone else did.... typical case of apples and oragnes...unrelated comparisons....
BOB RENTON

Gee Bob, are ya sayin your butt has no feeling at all??

It might not pull up that high and use the extra cfm much with manifolds. Would be nice if somebody in your area had a carb or two to try out. Some headers help hp more than others. Most give you big gains in torque.

Oh man, at one time I had around 11 carbs in the cabinet! Most of them were Holley DP's but for sure no spread bore Holleys. Never had one of those that worked right....at least not for me.

What Size Carburetor Do I Need?

Whenever I went by a 'calculator' for carb size, I usually ended up going with at least 200 CFM more lol

Well stated, but sometimes you just need some background information to fill in the gaps.
What Is A Cerebral Narcissist? 9 Signs To Spot One | mindbodygreen

I should send that link to a one time buddy of mine but he probably wouldn't read it anyways. He's already too smart and he'll deny he's a narcissist.....

 

[moparx]

i really like the T-quads.
it took several years to totally understand them, but after doing so, they have worked flawlessly on everything i have put them on.
i also have accumulated many of those over the years, as well as parts carbs, carb kits, metering rods, and jets. most of the time i have them given to me, or are super cheap to buy from guys that do not like them.
just my personal life experience with them.
your mileage will vary.

 

[Houle #382]

Yep that's the plan for today. Just do the bare minimum to get things moving once the adapter arrives and focus on getting the truck repaired in the meantime. Again. Modern coolant systems are ridiculously problematic and Fords are plastic Mexican crap.

The air screws aren't set from the factory? Not that it's difficult or anything but that's surprising. Glad to hear this carb works really well for everyone and is popular. I did manage to finagle a killer deal on it. I don't like where all the hoses run compared to the Holley though, all crowded up going in the front like that.

Yeah and it will be a fun process when it isn't a race against time.

Yes the air screws are set from the factory but with a modified engine it's always good to check them, it doesn't take but a minute with a vacuum gage

 

[Cranky]

i really like the T-quads.
it took several years to totally understand them, but after doing so, they have worked flawlessly on everything i have put them on.
i also have accumulated many of those over the years, as well as parts carbs, carb kits, metering rods, and jets. most of the time i have them given to me, or are super cheap to buy from guys that do not like them.
just my personal life experience with them.
your mileage will vary.

Have to say that the best street carb I ever had was a TQ! Did pretty good at the track too except the secondary air door needed to be a hair tighter. The very slight hesitation at the track didn't show on the street. Had several well tuned Holleys on various cars over the years but very few got close to the in town fuel mileage as the TQ and the DP's had horrible mileage in town but once out on the highway, they were pretty good. Never took the TQ equipped car out on the highway but it would knock down 17 in town and brisk driving. It had great throttle response without having to get hard on the throttle. You might have been one that bought a TQ strip kit from me years back.....

 

[kiwigtx]

Nice...

That would be the HEMI variation.

 

[icetech]

I'm using a Street demon which is basically a newer updated TQ... it's been a pretty good carb, no complaints at all so far.

 

[BSB67]

…Sadly there's really not much left of the track culture that I'm aware of….

Yep. Muscle car premise was about quick acceleration and beating the other guy. That’s mostly gone, despite all the talk about performance. I guess it’s a matter of what one’s definition is of performance.

Personally, I’d rather not have a minivan give me a run for the money.

 

[kiwigtx]

CHINESE AVS2's are a thing. Not really a counterfeit, cause it doesn't say Edelbrock (I don't think so, anyway).

I bought in a Chinese Carter look-a-like carb for my friend to use on Slant-six motor that was a barn find a few years ago.
Worked really well straight out of the box and is still going to this day. Much easier than rebuilding a 40-year-old turd that had been monkeyed with over the years.

 

[Cranky]

That would be the HEMI variation.

 

[33 IMP]

I bought in a Chinese Carter look-a-like carb for my friend to use on Slant-six motor that was a barn find a few years ago.
Worked really well straight out of the box and is still going to this day. Much easier than rebuilding a 40-year-old turd that had been monkeyed with over the years.

I was looking at the 4414 (I think that was the number) Chinese two bbl holleys, to modify for a Sixpack setup. I've got a manifold, no carbs. The carbs are dirt cheap. And, it STILL made no sense. I doubt they would run better than a 850 dp/ good single four manifold, and nothing I have needs the eyewash. Besides, even a repop aircleaner, fuel lines, and progressive linkage/new fuel bowls would probably be more than the carbs.
Oh well.......

 

[RJRENTON]

Gee Bob, are ya sayin your butt has no feeling at all??

Oh man, at one time I had around 11 carbs in the cabinet! Most of them were Holley DP's but for sure no spread bore Holleys. Never had one of those that worked right....at least not for me.

Whenever I went by a 'calculator' for carb size, I usually ended up going with at least 200 CFM more lol

I should send that link to a one time buddy of mine but he probably wouldn't read it anyways. He's already too smart and he'll deny he's a narcissist.....

Sure, I have feeling's for "DynaBro" and his issues, but that is a classical case of doing zero research b4 hand, then blaming everyone (me) for the results because he doesn't understand the concept. He has called me just about every name in the book that he can muster.....that is so childish and shows such immaturity.....but ....life is tough....and lessons learned......??
BOB RENTON