Demon Carburetor

When your engine deserves nothing but the best, Demon Carburetor® delivers the precision and power that serious enthusiasts demand. We specialize in high-performance carburetors that transform good engines into great ones, offering our legendary 750, 650, 850, and 625 CFM models designed for every application from street cruising to all-out racing.

About Demon Carburetor

Welcome to the world of Demon Carburetor®, where precision engineering meets pure automotive passion. We’re not just another parts supplier—we’re enthusiasts who understand that the right carburetor can transform your driving experience from ordinary to extraordinary.

Our specialty? High-performance carburetors that deliver exactly what serious gearheads demand: consistent power, reliable performance, and the kind of throttle response that puts a grin on your face every single time. Whether you’re building a weekend warrior, a dedicated race machine, or restoring a classic muscle car to its former glory, we’ve got you covered.

The Demon Carburetor® 750, 650, 850, and 625 lineup represents our commitment to providing the perfect carburetor for virtually any performance application. Each model is engineered with meticulous attention to detail, manufactured to exacting tolerances, and tested to ensure it delivers real-world results. The 650 offers precise fuel delivery for smaller displacement engines, the 750 hits that sweet spot for street/strip versatility, the 625 serves specialized performance needs, and the 850 unleashes maximum airflow for serious horsepower applications.

What makes us different? We actually care about your build. We’ve spent countless hours on racetracks, in workshops, and at car shows, talking with enthusiasts just like you. We know that choosing the right carburetor isn’t just about CFM ratings—it’s about understanding your application, your goals, and your expectations. That’s why every Demon Carburetor® comes backed by comprehensive technical support and detailed tuning resources.

At demoncarburetor.us, we’re committed to providing more than just products. We’re here to share knowledge, offer guidance, and help you achieve the performance you’ve been dreaming about. Because at the end of the day, your success is our success, and there’s nothing we love more than hearing about another engine running perfectly with a Demon Carburetor® breathing life into it.

Demon Carburetor Sales Today

Street Demon Carburetor - Shiny/Shiny

  • Ball burnished shiny aluminum finish
  • Designed for use on most stock to mildly modified V8s
  • Developed from the ground up with smooth styling – patented timeless design fits modern as well as traditional themed vehicles (Patent No.: US D648,746 S)
  • One piece airhorn is easy to clean and maintain

Street Demon Carburetor - Black/Black

  • Shadow Black ceramic coated finish acts as a protective barrier to corrosion and heat
  • Designed for use on most stock to mildly modified V8s
  • Developed from the ground up with smooth styling – patented timeless design fits modern and traditionally themed vehicles (Patent #: US D648,746 S)
  • One piece airhorn is easy to clean and maintain

750 CFM Street Demon Carburetor

  • Ball burnished shiny aluminum finish
  • Designed for use on most stock to mildly modified V8s
  • Developed from the ground up with smooth styling – patented timeless design fits modern as well as traditional themed vehicles (Patent No.: US D648,746 S)
  • One piece airhorn is easy to clean and maintain
  • Electric Choke Management means easy cold starts

Demon Air Cleaner 14" Black

  • 14 inches in diameter
  • 3 in deep black reusable filter element
  • Black painted finish
  • Low profile for ease of use with stock hoods
  • Tri-lobe wing nut is counter-bored and furnished with 1/4in and 5/16in internal threads
  • Demon logo stamped into the top

Why Choose Demon Carburetor

Precision Engineering That Delivers Real Results

Our high-performance carburetors aren’t just assembled—they’re precision-engineered using advanced computational fluid dynamics and real-world testing. Every venturi, passage, and circuit is optimized for maximum airflow efficiency and fuel atomization, translating directly into measurable horsepower gains you can feel.

Application-Specific Performance Solutions

We understand one size doesn’t fit all. That’s why we offer multiple CFM ratings—650, 625, 750, and 850—each specifically designed for different engine displacements and performance goals. Whether you’re running a small-block street cruiser or a big-block race monster, we have the perfect carburetor.

Uncompromising Quality Control Standards

Every Demon Carburetor® undergoes rigorous quality inspection before leaving our facility. We verify critical dimensions, test functionality, and ensure every component meets our exacting standards. When you unbox a Demon carburetor, you’re getting performance-ready equipment, not a project that needs sorting.

Tuner-Friendly Design and Adjustability

We build our carburetors for enthusiasts who love to tune. Accessible adjustment points, interchangeable jets, and comprehensive calibration options mean you can dial in the perfect air/fuel ratio for your specific combination. Tuning shouldn’t require specialized tools or engineering degrees—our design philosophy ensures it doesn’t.

Proven Track Record in Competition

From drag strips to road courses, Demon Carburetor® products have powered countless victories and personal bests. Racers choose our carburetors because they deliver consistent, repeatable performance round after round. When the tree drops or the green flag waves, you need equipment you can trust absolutely.

Comprehensive Technical Support and Resources

You’re never alone with a Demon Carburetor®. Our knowledgeable technical team provides real answers to real questions, backed by detailed tuning guides and application resources. We’re enthusiasts helping enthusiasts, and we’re genuinely invested in helping you achieve the performance you’re chasing.

Our Clients Thought

I've been through three different carburetors on my small-block 350, and honestly, I was getting frustrated. Nothing seemed to give me the crisp throttle response I wanted without sacrificing drivability. Then I installed the Demon Carburetor® 650, and wow—what a difference! The thing fired up on the first try, idled smooth as butter, and when I hit the gas, there was zero hesitation. Just immediate, linear power. I've put about 2,000 miles on it now, including some spirited highway runs and plenty of stop-and-go traffic, and it's been absolutely flawless. The fuel economy even improved slightly compared to my old setup. Installation was straightforward with good instructions, and the tuning adjustments are exactly where they should be—easy to access but not something you'll accidentally mess with. If you're on the fence about which carburetor to get for a street performance build, stop overthinking it and get the Demon. You won't regret it.
Marcus Thompson
Marcus Thompson
DUDE. This Demon 850 is absolutely SICK on my big-block!!! Been bracket racing for like 15 years and tried pretty much everything out there. Bolted this bad boy on my 468 and immediately went 3 tenths quicker. THREE TENTHS! My 60-foot times are way more consistent now too. The throttle response is insane - no bog, no stumble, just pure acceleration. Even my crew chief was impressed and he's usually hard to please lol. Best part? It's stayed consistent all season. Same jetting, same performance, pass after pass. Had one track day where we made 12 runs and every single one was within .02 of each other. That's the kind of reliability you need when you're trying to win rounds. Yeah it costs more than some other options but you get what you pay for. Quality construction, smooth operation, and most importantly - it WORKS. Already recommended it to three buddies at the track. If you're serious about going fast, get the Demon Carburetor®. Period.
Jake Richardson
Jake Richardson
As someone who approaches automotive projects methodically, I conducted extensive research before selecting a carburetor for my engine rebuild. After comparing specifications, reading technical documentation, and consulting with several experienced engine builders, I decided on the Demon Carburetor® 750. The decision proved correct. Upon receipt, I was immediately impressed by the manufacturing quality—precise machining, clean castings, and attention to detail throughout. The initial calibration was very close to optimal for my application (a 383 stroker with aluminum heads and a hydraulic roller cam). I made minor adjustments to the air/fuel mixture and power valve selection based on my specific combination, and the results have been exceptional. What particularly impressed me was the technical support. I had questions regarding accelerator pump selection for my specific camshaft profile, and the support team provided detailed, knowledgeable guidance. The carburetor has now logged approximately 5,000 miles with absolutely zero issues. Idle quality is excellent, part-throttle response is immediate, and wide-open throttle performance exceeds my expectations. For those seeking a well-engineered, properly manufactured carburetor backed by competent technical support, I highly recommend Demon Carburetor®.
Robert Chen
Robert Chen
I'll be honest—I wasn't sure about spending this much on a carburetor for my old Ford truck. It's a '78 F-150 with a 351M that I use for weekend camping trips and hauling stuff around my property, so it's not exactly a show truck or race vehicle. But the old carburetor was giving me constant headaches: hard starting, rough idle, terrible fuel economy, and it would flood if I looked at it wrong. My neighbor, who's been building engines forever, suggested I try a Demon Carburetor® 650 instead of trying to rebuild the worn-out original again. I'm so glad I listened to him! The difference was like night and day. The truck starts easily every time, even on cold mornings. It idles smooth and doesn't stall when I'm backing up my camper trailer. The throttle response is way better—much more predictable when I'm navigating rough terrain on my property. And surprisingly, my fuel economy improved enough that the carburetor will probably pay for itself in a couple years. Installation was easy enough that I did it myself in my driveway with basic tools. If you're tired of fighting with a problematic carburetor, do yourself a favor and upgrade to a Demon. It's worth every penny.
Sarah Mitchell
Sarah Mitchell
Road racing presents unique challenges that drag racing doesn't—sustained high-RPM operation, constant throttle transitions, lateral g-forces affecting fuel delivery, and the need for absolutely consistent performance over 20-30 minute sessions. I'd been struggling with fuel starvation issues in long sweepers with my previous carburetor setup, which was costing me time and, frankly, making the car unpredictable in critical moments. A fellow racer running in the vintage Trans-Am series recommended I look at the Demon Carburetor® 750, specifically mentioning their superior float design and metering consistency. After installation and initial testing, the improvement was immediately noticeable. Corner exit is now smooth and progressive—no more lean stumble when transitioning from maintenance throttle to acceleration. The float system handles lateral loads beautifully; I'm pulling over 1.2g in some corners without any hint of fuel delivery issues. What really sold me was the consistency over a full race distance. Lap times stay within two-tenths from lap one to lap twenty-five, which tells me the fuel delivery remains optimal even as fuel level drops and temperatures rise. The tunability is excellent too—I can make precise adjustments for different tracks and conditions. For road racing and circle track applications, this Demon Carburetor® is absolutely top-tier equipment.
Vincent Delgado
Vincent Delgado

Blogs & News

FAQs

A good rule of thumb: multiply your engine's cubic inches by maximum RPM, then divide by 3,456. For street engines, slightly undersizing often improves throttle response and drivability. Our Demon Carburetor® 750, 650, 850, and 625 models cover most popular applications. The 650 works great for 302-350 cubic inch engines, the 750 suits 350-450 cubic inch street/strip builds, the 625 fits specialized smaller applications, and the 850 handles big-blocks and serious horsepower. When in doubt, contact our technical team—we're happy to help you select the perfect match for your specific combination.

Not at all! Demon Carburetor® products are designed with user-friendly adjustment points. The air/fuel mixture screws are easily accessible, and our comprehensive tuning guides walk you through each step in plain language. Most installations run great with minimal adjustment right out of the box. We include baseline jetting that works for typical applications, so you're not starting from zero. If you can turn a screwdriver and follow instructions, you can tune a Demon carburetor. Plus, our technical support team is available to answer questions and guide you through any adjustments needed for your specific setup.

Absolutely! High-performance carburetors like our Demon models are completely compatible with electronic ignition systems, distributorless systems, and modern engine management for spark control. The carburetor handles fuel delivery while your ignition system manages spark timing—they work together perfectly. Many enthusiasts run Demon carburetors with MSD ignitions, HEI distributors, and various aftermarket electronic timing controls without any issues. The key is ensuring your ignition timing is properly set to complement the improved fuel delivery your new carburetor provides, which often means you'll want to fine-tune your advance curve for optimal performance.

With proper maintenance, a Demon Carburetor® can run for many years without requiring a rebuild. Street-driven vehicles typically need attention every 50,000-100,000 miles, while race applications may need more frequent service depending on usage intensity. Regular maintenance includes checking fuel level, inspecting gaskets, and cleaning filters—simple tasks that prevent problems. Signs you might need a rebuild include fuel leaks, flooding, hard starting, or significant changes in performance. The good news? Demon carburetors are built with quality components that resist wear, and complete rebuild kits are readily available when the time comes.

Yes! Demon Carburetor® 750, 650, 850, and 625 models work perfectly with pump gasoline. They're designed to atomize and meter any gasoline properly, from regular 87 octane to premium 93 octane and everything in between. Your octane choice should be based on your engine's compression ratio and timing requirements, not your carburetor. Higher-performance engines with more compression or aggressive timing may require premium fuel to prevent detonation, but that's an engine consideration, not a carburetor limitation. The Demon carburetor will deliver whatever fuel you put in the tank—it just does it more efficiently than lesser carburetors.

Every Demon Carburetor® comes complete and ready to install. You'll receive the fully assembled carburetor, mounting gaskets, installation instructions, and tuning guidelines. The carburetor arrives with baseline jetting appropriate for typical applications, so most users can install and run with minimal adjustment. Some models include fuel line fittings, while others allow you to choose your preferred fitting style. We provide comprehensive documentation covering installation, initial setup, tuning procedures, and troubleshooting. Everything you need to get running is in the box—you just need basic hand tools, a fuel supply, and throttle linkage appropriate for your application.

High-performance carburetors work with standard fuel system components. Most Demon models accept common AN fittings or traditional inverted flare fittings for fuel inlet connections. We recommend using quality braided stainless or rubber fuel line rated for gasoline and your expected pressure range. Fuel line size should be 3/8-inch minimum for most applications, with 1/2-inch preferred for high-horsepower or racing setups. A quality fuel filter is essential to protect the needle and seat from debris. Fuel pressure should be regulated to 5-7 PSI for naturally aspirated applications—higher pressure requires special needle and seat assemblies, which are available.

Yes, but it requires specific setup considerations. The Demon Carburetor® 850 is popular in blow-through turbo and supercharger applications. You'll need a sealed carburetor hat or enclosure to prevent fuel from being pushed out of vent tubes under boost. Special high-pressure needle and seat assemblies are essential, as boost pressure increases fuel pressure requirements significantly. Jetting will need adjustment—forced induction engines require richer mixtures and different accelerator pump settings. Many successful boosted combinations use Demon carburetors, but proper setup is critical. We recommend consulting with experienced forced induction builders and our technical team for application-specific guidance.

We stand behind our products with comprehensive warranty coverage against manufacturing defects. Demon Carburetor® products are warranted to be free from defects in materials and workmanship under normal use and service. This coverage protects you against issues like casting defects, machining errors, or component failures due to manufacturing problems. The warranty doesn't cover damage from improper installation, incorrect tuning, contaminated fuel, or normal wear from use. We also don't cover carburetors that have been disassembled or modified. If you experience any issues, contact us immediately—we're committed to making things right and ensuring your complete satisfaction with our products.

Most enthusiasts with basic mechanical skills can install a Demon Carburetor® successfully. If you can change spark plugs and adjust a distributor, you can install a carburetor. The process involves mounting the carburetor to your intake manifold with a proper gasket, connecting fuel and vacuum lines, hooking up throttle linkage, and making basic adjustments. Our detailed instructions guide you through each step. However, if you're uncomfortable working with fuel systems or don't have appropriate tools, professional installation ensures everything is done correctly. Initial tuning might require some patience and adjustment, but our support team can help walk you through the process if needed.