The small block Chevy 350 is among the most carb-friendly engines ever built, which is exactly why choosing the right one can feel overwhelming. A mild street 350 with stock heads wants a very different carburetor than a built motor running a hot cam and a dual plane intake, and bolting on too much carburetor is the single most common mistake people make. For most stock to mildly modified 350s, a 600 to 750 CFM unit is the sweet spot, and the choice really comes down to vacuum secondaries versus mechanical, and how much tuning you want to do.
We pulled together the seven carburetors that consistently earn the best feedback from SBC 350 owners, covering everything from drop on and drive Edelbrock AVS2 units to fully adjustable Holley and Quick Fuel pieces for guys who like to tinker. Every pick below is a real, widely sold carburetor that bolts to a standard square bore intake. We have noted who each one suits, what it does well, and the honest weak spot you should know about before you buy.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
Edelbrock 1406 Performer 600 CFM Best Overall 600 CFM, electric choke, manual secondaries, square bore, no fuel pressure regulator needed |
9.5 | 🛒 Check Price |
 |
Edelbrock 1906 AVS2 650 CFM Best for Daily Drivers 650 CFM, electric choke, annular boosters, adjustable secondary air valve |
9.3 | 🛒 Check Price |
 |
Holley 0-1850 4160 600 CFM Best Classic Choice 600 CFM, vacuum secondaries, electric choke, single feed 4160 design |
9.2 | 🛒 Check Price |
 |
Holley 0-80457S Street Avenger 670 CFM Best Vacuum Secondary 670 CFM, vacuum secondaries, electric choke, dual feed fuel inlets |
9.1 | 🛒 Check Price |
 |
Holley 0-80508S 750 CFM Double Pumper Best for Performance 750 CFM, mechanical secondaries, dual accelerator pumps, manual choke |
9.0 | 🛒 Check Price |
 |
Quick Fuel Slayer SL-600-VS 600 CFM Best Value Performance 600 CFM, vacuum secondaries, electric choke, single feed 4160 style |
8.7 | 🛒 Check Price |
 |
Demon 1402 Street Demon 625 CFM Best Polished Looks 625 CFM, electric choke, triple stage secondary, polymer fuel bowl |
8.5 | 🛒 Check Price |
1. Edelbrock 1406 Performer 600 CFM: Best Overall
If you want one carburetor that will make a stock or lightly modified SBC 350 run beautifully with almost zero drama, the Edelbrock 1406 is the answer. The 600 CFM rating is correctly sized for the displacement, so you get strong low end torque, a clean idle, and good fuel economy without the bog that plagues oversized carbs. The electric choke means cold mornings are a non issue, and because Edelbrock uses metering rods instead of removable jets, you can lean or richen the mixture in minutes with a screwdriver and the rod and spring kit that ships in the box. For a daily driver, a weekend cruiser, or a stock rebuild, this is the most foolproof carburetor on the list.
The honest weakness is performance ceiling. The 1406 is a touch conservative once you start adding a bigger cam, ported heads, or you intend to chase peak power at the strip. The Edelbrock boosters do not signal fuel as aggressively as the annular boosters on some race oriented units, so throttle response can feel slightly softer to enthusiasts coming off a tuned Holley. For a built motor you will want the AVS2 or a 750. But for the engine most people actually own, the 1406 delivers more usable, reliable performance than anything else here.
- 600 CFM calibration tuned for stock to mild 350 street engines
- Electric choke for easy cold starts with no manual cable
- Metering rod design lets you tune with a screwdriver, no fuel bowls to drain
Pros: Runs great out of the box on most stock and mild 350s; Extremely easy to tune with included rods and springs; No gasket leaks, holds a steady idle for years
Cons: Not the best choice for aggressive cams or high RPM strip use; Annular boosters of competitors give slightly crisper throttle response
2. Edelbrock 1906 AVS2 650 CFM: Best for Daily Drivers
The AVS2 is Edelbrock’s modern take on the square bore four barrel, and the 650 CFM 1906 is arguably the best all around street carb they make for a 350. The headline upgrade is the annular primary boosters, which atomize fuel far better at low speed than the old down leg style, so the engine pulls cleanly the instant you crack the throttle. The other big win is the adjustable secondary air valve, a small screw that lets you tailor how quickly the secondaries open. That single feature lets you eliminate the off idle stumble that frustrates so many carb swappers, without any disassembly.
Where it falls a little short is in pure simplicity. The 1906 has more tuning adjustability than the 1406, which is a strength for enthusiasts but means a first time carb owner has slightly more to learn. The 650 CFM rating is ideal for a stock to mild 350 but can feel marginally undersized if you are running a stroker or a high compression, big cam combination that wants to breathe. For the typical street 350 that sees some spirited driving, though, the AVS2 650 is hard to beat for refinement.
- AVS2 annular primary boosters for sharper off idle response
- Adjustable secondary air valve tunes out the dreaded tip in stumble
- 650 CFM bridges stock and mildly built 350 combos
Pros: Crisper throttle response than the classic Performer series; Secondary air valve adjustment dials out hesitation; Calibrated rich enough to run well on most 350s as delivered
Cons: Slightly more involved to fine tune than the basic 1406; 650 CFM may feel marginal on a heavily built stroker
3. Holley 0-1850 4160 600 CFM: Best Classic Choice
The Holley 0-1850 is the carburetor that has powered more small block Chevys than almost any other, and for good reason. At 600 CFM with vacuum secondaries, it is correctly sized for a 350 and the vacuum operated secondary throttle plates open progressively based on engine demand, which makes it smooth and forgiving in stop and go traffic. The 4160 design uses a metering plate on the secondary side rather than a full metering block, keeping it simple to service. Because this carb has been around for decades, the depth of available knowledge, tuning kits, and replacement parts is unmatched, so you are never stuck if something needs adjusting.
The trade off is that the single feed fuel inlet and the paper bowl gaskets are a known fussy point. Overtighten the bowl screws and you can get a slow weep, and many owners eventually add a dual feed line and braided fuel log for reassurance. The factory jetting is also a conservative starting point, so getting the most out of it usually means a jet swap or a vacuum secondary spring change. None of this is hard, but it is more hands on than a drop on Edelbrock. If you enjoy tuning, the 0-1850 rewards you.
- Legendary 600 CFM vacuum secondary platform proven on millions of SBCs
- Vacuum secondaries adapt to engine load for smooth daily driving
- Massive aftermarket support for jets, cams, and rebuild kits
Pros: Vacuum secondaries are forgiving and great for street use; Endless parts availability and tuning knowledge online; Lightweight aluminum main body
Cons: Single feed fuel inlet and gaskets can weep if overtightened; Out of box calibration often needs a jet tweak for best results
4. Holley 0-80457S Street Avenger 670 CFM: Best Vacuum Secondary
The Street Avenger is Holley’s answer to the criticism that classic Holleys need too much fiddling. The 0-80457S comes calibrated from the factory to run well on a street driven small block right away, so it splits the difference between the plug and play Edelbrocks and the more raw 0-1850. At 670 CFM with vacuum secondaries, it has a touch more breathing capacity than the base 600 unit, which suits a 350 that has a freer flowing intake or exhaust. The dual feed fuel bowls and built in inlets are a meaningful upgrade over the single feed 1850, delivering more consistent fuel under hard throttle.
The downside is mild but worth noting. At 670 CFM, this carb is sized for a 350 that has at least a few breathing modifications, and on a totally stock low compression engine you may give up a sliver of low end crispness compared to a 600. The electric choke also needs a switched twelve volt source wired correctly to work properly, which is one extra step versus a manual choke. For a street 350 with bolt ons, though, the Street Avenger is a very satisfying out of box experiences in the Holley lineup.
- 670 CFM vacuum secondary tuned specifically for street performance
- Dual feed fuel bowls for steadier fuel delivery under load
- Tumble polished finish and quick change vacuum secondary housing
Pros: Out of box calibration is well sorted for a street 350; Dual feed inlets reduce fuel starvation on hard acceleration; Vacuum secondaries keep it docile in traffic
Cons: Slightly more carburetor than a truly stock 350 needs; Electric choke wiring takes a little setup
5. Holley 0-80508S 750 CFM Double Pumper: Best for Performance
When your 350 has grown a healthy cam, better heads, and a dual plane or single plane intake, a mechanical secondary double pumper like the 0-80508S transforms how the engine feels. With both throttle bores opening directly off the linkage and a pair of accelerator pumps shooting fuel the instant you stab the pedal, the response is immediate and aggressive in a way no vacuum secondary carb can match. The 4150 platform also gives you four corner idle adjustment and full metering blocks at both ends, so a knowledgeable tuner can dial in a lopey cam idle and a clean wide open run with precision.
This carburetor is a specialist tool, and that is its weakness on a typical build. The mechanical secondaries reward you with response but punish fuel economy and tip in manners if the engine is not built to use the airflow, so on a mild or stock 350 it will feel thirsty and may stumble off idle. It also asks more of the person tuning it, since there are more circuits to get right. Put it on the correct combination, a built 350 that revs, and it is glorious. Put it on a grocery getter and you will wish you bought a 600.
- 750 CFM mechanical secondary design for serious throttle response
- Dual accelerator pumps eliminate bog on hard launches
- 4150 four corner idle for precise tuning on lumpy cams
Pros: Instant, hard hitting throttle response; Four corner idle circuits handle big cams well; Highly tunable with full metering blocks front and rear
Cons: Mechanical secondaries hurt economy and need a tuner who knows them; Too much carburetor for a stock, mild street 350
6. Quick Fuel Slayer SL-600-VS 600 CFM: Best Value Performance
Quick Fuel built the Slayer series to give street car owners a genuinely capable carburetor without demanding a tuner’s expertise, and the 600 CFM vacuum secondary version is a smart match for a 350. It shares the familiar Holley style architecture, so it bolts to the same square bore intakes and accepts common jets and accelerator pump cams, which keeps tuning parts cheap and easy to find. The black non stick coating shrugs off fuel stains and looks the part under the hood. Out of the box it runs cleanly on a stock to mild small block, with vacuum secondaries that keep it civil for daily driving.
The honest caveat is the support ecosystem. While the hardware is solid and shares Holley pattern parts, Quick Fuel does not have quite the same mountain of model specific tuning guides and forum threads that the 0-1850 enjoys, so a beginner may lean on Holley resources to dial it in. The factory vacuum secondary spring is also a conservative choice and many owners swap to a lighter spring for snappier secondary opening. Those are small asks for a carburetor that punches above its standing on a street 350.
- 600 CFM vacuum secondary aimed at street SBC builds
- Non stick black diamond finish resists fuel staining
- Tunable with standard Holley style jets and parts
Pros: Strong street manners straight out of the box; Uses common Holley pattern tuning parts; Good fit and finish for the segment
Cons: Less factory tuning documentation than Holley or Edelbrock; Vacuum secondary spring may need a swap for best feel
7. Demon 1402 Street Demon 625 CFM: Best Polished Looks
The Street Demon is a clever modern square bore design that fits a 350 beautifully. Its standout feature is the triple stage secondary controlled by a goggle valve, which opens airflow progressively for an exceptionally smooth power delivery with no flat spots as the secondaries come in. At 625 CFM it is sized right for a stock or mildly modified small block, and the insulated polymer fuel bowl is a genuinely useful touch on a hot SBC, since it resists the heat soak that causes hard hot starts and fuel percolation. The compact body also tucks under low hoods where a taller Holley might not clear.
The limitation is breadth of use and parts. At 625 CFM the Street Demon is happiest on stock to mild engines, and it is not the carburetor you reach for once a build starts wanting serious airflow. The tuning parts catalog is also smaller than the vast Holley universe, so while the carb runs well as delivered, deep custom tuning has fewer off the shelf options. For an owner who values smooth manners, good looks, and trouble free hot starts on a street 350, the Street Demon is a likeable and capable choice.
- 625 CFM with a progressive triple stage secondary for smooth power
- Goggle valve secondary meters airflow precisely for clean transitions
- Insulated polymer fuel bowl reduces heat soak and hot start trouble
Pros: Excellent throttle transition with the triple stage secondary; Polymer bowl resists heat soak for better hot restarts; Compact body clears low hoods and air cleaners
Cons: 625 CFM is best suited to stock and mild builds only; Fewer aftermarket tuning parts than Holley platforms
Frequently Asked Questions
What size carburetor is best for a SBC 350?
For the vast majority of small block Chevy 350 engines, a 600 to 650 CFM carburetor is the sweet spot. A stock or mildly modified 350 simply does not move enough air to use a giant carb, and going too big causes a lazy throttle, poor fuel economy, and an off idle bog. Step up to 670 to 750 CFM only when the engine has real breathing upgrades such as a performance cam, ported heads, a better intake, and headers. The classic rule is that engine displacement times max RPM divided by 3456 gives a rough CFM target, and a streetable 350 rarely needs more than about 650.
Should I choose vacuum or mechanical secondaries for a street 350?
For a daily driven or street 350, vacuum secondaries are almost always the better choice. They open the second pair of throttle bores progressively based on engine demand, which makes the car smooth, forgiving, and economical in normal driving, and they are far harder to bog. Mechanical secondaries, found on double pumper style carbs, open directly with the linkage for instant, aggressive response, but they only shine on a built engine that can actually use the airflow. On a mild street car a double pumper will feel thirsty and twitchy, so save mechanical secondaries for a performance focused build.
Is Edelbrock or Holley better for a 350?
Both are excellent, and the right answer depends on how much you enjoy tuning. Edelbrock carburetors like the 1406 and the AVS2 are famous for running well right out of the box with minimal fuss, using metering rods you can change with a screwdriver and rarely leaking. Holley carburetors offer deeper tunability, a vast parts catalog, and that classic feel, but the bowl gaskets and single feed designs can be a little fussier. If you want plug and play simplicity, go Edelbrock. If you love to tune and want endless adjustability and support, go Holley. There is no wrong choice for a 350.
Do I need a fuel pressure regulator for these carburetors?
It depends on the carburetor and your fuel system. Edelbrock carburetors are generally happy with a standard mechanical fuel pump and typically do not require a regulator, which is part of their plug and play appeal. Holley, Quick Fuel, and Demon carbs usually prefer fuel pressure in the range of about 5 to 7 PSI, and if your pump pushes more than that, a regulator is recommended to prevent flooding and to keep the needle and seat from being overwhelmed. If you are running an electric fuel pump or a high volume mechanical pump, adding an adjustable regulator is cheap insurance for any of these carbs.
Will these carburetors bolt onto my existing intake manifold?
Every carburetor in this guide uses the standard square bore four barrel flange, which is the most common intake bolt pattern on a small block Chevy 350. If your intake manifold is a square bore design, which the overwhelming majority of SBC intakes are, these carbs bolt straight on with a standard carburetor gasket. The only time you need an adapter is if your manifold has a spread bore Quadrajet pattern, in which case a thin spread bore to square bore adapter plate solves it. Always confirm your throttle and kickdown linkage and your air cleaner stud height clear the new carburetor before final assembly.
Our Verdict
For most small block Chevy 350 owners, the Edelbrock 1406 Performer 600 CFM is our top pick because it nails the correct size, runs cleanly right out of the box, and is the easiest carburetor here to live with and tune over the long haul. If you want a little more modern crispness and the ability to fine tune your secondaries on a street car that sees spirited driving, the Edelbrock AVS2 650 CFM is our runner up and a superb all around choice. Buyers chasing maximum performance on a built motor should look hard at the Holley 750 double pumper, while traditionalists and tuners will feel right at home with the classic Holley 0-1850.
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