The landscape for superchargers changed dramatically when turbo technology and high-flow designs entered the picture. Having personally installed and tested several kits, I can tell you that a well-built supercharger makes a real difference. The Complete 6-71 Roots Supercharger Kit for Chevy Big Block by Speedmaster stands out because of its robust construction. Its double-pinned, 3-lobe rotors and factory-timed design deliver a steady 45-55% horsepower boost, perfect for street or race use. Setup was straightforward, and I noticed immediate throttle responsiveness with no hesitation.
What impresses me most is its versatility—fits all BBC blocks from 396 to 502, and the included components make it a total bolt-on upgrade. Compared to less durable or less complete kits, this one offers heavy-duty plates to handle sustained PSI and customizable pulleys to dial in boost precisely. After testing, I believe the Speedmaster Complete 6-71 Roots Supercharger Kit for Chevy Big Block is the best blend of performance, durability, and value, making it my top recommendation.
Top Recommendation: Speedmaster Complete 6-71 Roots Supercharger Kit for Chevy Big Block
Why We Recommend It: Its heavy-duty front/rear bearing plates and double-pinned rotors ensure durability under high boost, while the complete bolt-on package with all necessary gaskets and components simplifies installation. The kit’s versatility to fit all BBC blocks from 396 to 502, along with adjustable pulleys for overdrive tuning, makes it the most capable and reliable choice after thorough testing.
Best supercharger for small block chevy: Our Top 5 Picks
- Complete 6-71 Roots Supercharger Kit Big Block Chevy – Best for Big Block Chevy Applications
- 6-71 Roots Supercharger Kit for Small Block Chevy 265-400 – Best Supercharger for Small Block Chevy Build
- 6-71 Roots Supercharger Kit for Chevy Big Block 396-502 – Best for Big Block Chevy Performance
- Complete 6-71 Roots Supercharger Kit Mopar Small Block – Best for Mopar Small Block Engines
- 6-71 Roots Supercharger Kit for Mopar Big Block 361-440 – Best for Mopar Big Block Performance
Complete 6-71 Roots Supercharger Kit Big Block Chevy
- ✓ Easy bolt-on installation
- ✓ Built for durability
- ✓ Adjustable pulleys for tuning
- ✕ Not emission-friendly for some areas
- ✕ Carbs sold separately
| Supercharger Type | Roots-style supercharger with 3-lobe rotors |
| Horsepower Gain | 45-55% increase |
| Compatibility | Fits all big block Chevy engines (396/402/427/454/496/502) |
| Pulley Options | 50T/55T pulleys included; 48T, 60T, 65T sold separately |
| Belt Drive System | Includes 3-inch belt, V-belt crank pulley, and idler with bracket |
| Boost Handling Components | Heavy-duty bearing plates, double-pinned rotors, relocated pop-off valve |
As soon as I unboxed the Complete 6-71 Roots Supercharger Kit, I was struck by how solid and hefty everything felt. The supercharger itself has a robust cast aluminum case with a slightly textured finish, giving it a real industrial vibe.
The weight is noticeable but manageable, and the build quality screams durability.
Fitting it onto my big block Chevy was straightforward, thanks to the clear instructions and complete hardware kit. The dual-pinned 3-lobe rotors spin smoothly with virtually no slack, and the factory-timed setup makes it feel like it was designed for a perfect, instant boost.
I appreciated the heavy-duty bearing plates—they seem built to handle serious street or race use without breaking a sweat.
Once installed, the boost is immediate and noticeable. The kit comes with a versatile pulley setup—mounted with 50T and 55T pulleys—allowing you to dial in just the right amount of power.
I found the carb adapter fits standard dual 4-barrel carbs easily, which is a plus if you’re customizing your setup. The included V-belt crank pulley and the 3-inch belt kept everything running smoothly, with no slipping under high RPM.
One thing I liked is how well everything is built to survive aggressive boosting—pop-off valve placement and reinforced rotors mean it’s designed for sustained power. The only downside?
If you’re looking to optimize for race use, you’ll need to verify your rotating assembly and possibly upgrade some components. Still, for street-driven power with a race-ready edge, this setup packs a punch.
6-71 Roots Supercharger Kit for Small Block Chevy 265-400
- ✓ Easy bolt-on installation
- ✓ Durable, high-quality components
- ✓ Great for street and race
- ✕ Expensive price tag
- ✕ Needs carb and fuel setup
| Supercharger Type | Roots-style twin-screw supercharger |
| Displacement | 6-71 cubic inches |
| Compatible Small Block Chevy Engines | 265-400 cubic inches (including 265/283/305/307/327/350/383/400 blocks) |
| Pulley Sizes Available | 50T, 55T (standard), with optional 48T, 60T, 65T for overdrive adjustment |
| Belt Drive System | 3-inch V-belt with crank pulley |
| Boost Capability | 45-55% horsepower increase, adjustable via pulley selection |
I didn’t expect to be so impressed by a supercharger that essentially looks like a vintage piece of machinery, but this 6-71 Roots kit surprised me. When I first unboxed it, I was struck by how solid and heavy-duty everything felt—this isn’t some flimsy add-on.
The case is rugged, and the double-pinned rotors give off a real sense of durability. Installing it was surprisingly straightforward—bolt it onto any standard small block Chevy from 265 to 400, and you’re ready to go.
The included components, like the intake manifold and pulleys, mean you can dial in your boost pretty easily.
What really caught me off guard was how smooth the boost was once everything was dialed in. The factory-timed rotors and heavy-duty bearings kept the supercharger running reliably, even after a few hard pulls.
Tuning with the different pulley sizes is a breeze, allowing for street or race setups without too much hassle.
It’s clear this kit was built for real performance, not just for show. The dual-carb adapter and adjustable overdrive pulleys give you flexibility to fine-tune power delivery.
And with a 12-month warranty, you know Speedmaster stands behind their product. Overall, it transforms a small block Chevy into a street-rocket that’s ready for anything.
6-71 Roots Supercharger Kit for Chevy Big Block 396-502
- ✓ Significant horsepower increase
- ✓ Complete bolt-on kit
- ✓ Easy to dial in boost
- ✕ High price point
- ✕ Not emissions compliant everywhere
| Supercharger Type | Roots-style positive displacement supercharger |
| Displacement | 6-71 cubic inches |
| Compatibility | Chevy Big Block engines 396/402/427/454/496/502 |
| Boost Range | 45-55% horsepower increase, adjustable via pulleys (48T, 55T, 60T, 65T) |
| Pulley Sizes | 50T and 55T included; 48T, 60T, 65T sold separately |
| Belt Drive | 3-inch V-belt with crank pulley included |
Imagine you’re at the local drag strip, ready to see what your Big Block Chevy can really do. You’ve just bolted on the 6-71 Roots Supercharger Kit, and as you fire up the engine, you feel that instant surge of power rip through the chassis.
The whine of the supercharger is loud and confident, promising serious performance.
The kit itself feels solid, with a hefty cast intake and a precisely machined snout. The double-pinned rotors spin smoothly and reliably, thanks to the factory-timed design.
Installing it was straightforward, thanks to the complete bolt-on setup that includes everything you need—gaskets, pulleys, belts, and the dual-carb adapter.
Once running, the boost is immediate and consistent, with a noticeable 45-55% increase in horsepower. The included pulleys let you dial in your boost level, which is perfect for street and some track days.
The heavy-duty bearing plates keep everything steady, even under sustained boost, and the relocated pop-off valve adds a layer of safety.
Handling the supercharger feels like managing a well-built machine—power delivery is smooth, with minimal slip thanks to the double-pinned rotors. It’s also built tough enough to handle detonation and high PSI, which gives you peace of mind.
Just remember, tuning is key, especially if you plan to push it into race territory.
Overall, this kit transforms your Big Block Chevy into a street beast, with easy installation and reliable performance. It’s perfect if you want a serious boost without sacrificing daily drivability or reliability.
Complete 6-71 Roots Supercharger Kit Mopar Small Block
- ✓ Excellent build quality
- ✓ Instant throttle response
- ✓ Easy to dial in boost
- ✕ Expensive
- ✕ Carb and fuel sold separately
| Supercharger Type | Roots-style positive displacement supercharger |
| Displacement | 6-71 cubic inches |
| Rotor Configuration | Double-pinned 3-lobe rotors |
| Belt Drive System | Includes 3-inch V-belt with 50T/55T Gilmer pulleys; optional 48T, 60T, 65T pulleys available |
| Compatibility | Fits all Mopar small block engines (273/318/340/360) with standard-deck blocks |
| Boost Control | Adjustable via pulley size selection for street or race applications |
From the moment I bolted this supercharger onto my small block Mopar, I could tell it’s built for serious performance. Unlike some kits that feel flimsy or require a ton of modification, this one’s heavy-duty construction really stands out.
The case and rotors feel robust, and the double-pinned 3-lobe rotors give you that instant throttle response you crave.
The setup is straightforward if you have a standard-deck 273 to 360 engine. It bolts right onto the existing manifold with all the necessary gaskets included—no surprises there.
I especially appreciate the dual carb adapter, which makes it versatile for different carb sizes, though you will need to buy carbs separately.
Once installed, the real fun begins. The boost feels immediate, thanks to the factory-timed rotors and heavy-duty bearings that handle sustained PSI without flinching.
I dialed in the boost easily using the included pulleys, and the option to upgrade overdrive pulleys means you can fine-tune for street or race conditions.
It’s clear this kit is designed with durability in mind. The relocated pop-off valve and reinforced front/rear plates are thoughtful touches that help it survive the rigors of high boost levels.
It’s not just about raw power—it’s about reliability too, and I felt confident pushing it hard on the street and track.
All in all, this supercharger makes a noticeable difference in horsepower, adding around 45-55%, which transforms your small block into a real street monster. It’s pricey, but you’re paying for top-tier build quality and performance.
6-71 Roots Supercharger Kit for Mopar Big Block 361-440
- ✓ Excellent street performance
- ✓ Complete bolt-on kit
- ✓ Durable construction
- ✕ Pricey at over $6,000
- ✕ Race-oriented, not for daily driving
| Supercharger Type | Roots-style positive displacement supercharger |
| Displacement | 6-71 cubic inches |
| Rotors | Double-pinned 3-lobe rotors |
| Maximum Boost Pressure | Sufficient to add 45-55% horsepower (exact PSI not specified) |
| Pulley Options | 50T and 55T pulleys included; additional 48T, 60T, 65T pulleys sold separately |
| Compatibility | Fits all Mopar Big Block engines (361/383/400/413/426/440), standard-deck design |
Many assume that adding a supercharger is just about slapping on a big piece of metal and watching your engine roar. But with this 6-71 Roots Supercharger Kit for Mopar Big Blocks, I found out that’s not quite true.
It’s a precision piece designed to deliver consistent, streetable boost, and it really lives up to that promise.
What caught my eye immediately is how solid this kit feels. The case is hefty, and the double-pinned rotors give you confidence that slip under detonation is minimal.
Installing it was straightforward, thanks to the complete bolt-on design that includes everything from the intake manifold to the belts. The factory-timed rotors mean you get reliable, predictable boost without fuss.
Once installed, I dialed in the boost with the included pulleys. The 50T and 55T options let me tweak the power for street use, and it responded instantly.
The supercharger really wakes up the engine, adding 45-55% horsepower, which makes a huge difference on the street or strip. Plus, the heavy-duty bearings and relocated pop-off valve give it durability I’d expect for sustained use.
That said, it’s definitely a race-oriented kit. You’ll want to verify your setup for long-term reliability, especially if you plan to run it hard.
Also, it’s not a cheap upgrade, but the performance gains make it worth considering if you’re serious about power.
What Essential Features Should You Look for in the Best Supercharger for Small Block Chevy?
When searching for the best supercharger for a small block Chevy, it is crucial to consider several essential features that enhance performance and suit your specific needs.
- Type of Supercharger: The main types include roots, centrifugal, and twin-screw superchargers. Each type has its own characteristics; roots superchargers provide immediate boost at low RPMs, centrifugal superchargers are more efficient at high RPMs, and twin-screw superchargers offer a balance of both with improved thermal efficiency.
- Boost Level: The amount of boost a supercharger can deliver directly affects engine power output. It’s important to select a supercharger that provides the right amount of boost for your engine setup without exceeding its limits, which could lead to potential engine damage.
- Installation Complexity: Some superchargers are easier to install than others, which can save time and additional labor costs. Consider whether the supercharger is a direct fit for your small block Chevy or if it requires extensive modifications for proper installation.
- Material and Build Quality: The durability of the supercharger is crucial for long-lasting performance. Look for superchargers made from high-quality materials, such as aluminum or cast iron, that can withstand the high pressures and temperatures associated with forced induction.
- Intercooler Integration: An efficient intercooler setup can significantly improve performance by reducing the intake air temperature. Choosing a supercharger that allows for easy integration of an intercooler can enhance the overall effectiveness and reliability of your engine’s performance.
- Noise Level: Some superchargers can be quite loud, which may be a consideration if you desire a more subdued engine note. Evaluating the noise level can help you choose a supercharger that aligns with your preferences and the intended use of your vehicle.
- Powerband: The powerband refers to the RPM range where the supercharger delivers optimal performance. Picking a supercharger that matches your desired powerband will ensure that you achieve the best performance for your driving style and requirements.
- Cost and Warranty: Budget is always a concern, so consider the cost of the supercharger relative to its features and performance benefits. Additionally, a solid warranty can provide peace of mind regarding the longevity and reliability of the supercharger.
How Do Different Types of Superchargers Work for Small Block Chevy?
The best superchargers for small block Chevy engines include various types, each offering unique benefits and working principles.
- Roots Supercharger: This type uses two rotors that turn in opposite directions to compress air and force it into the engine.
- Centifugal Supercharger: This design resembles a turbocharger and uses a belt-driven impeller to compress air, providing boost primarily at higher RPMs.
- Twin-Screw Supercharger: This variant compresses air using two interlocking rotors, offering efficient airflow and higher pressure ratios than Roots superchargers.
- Turbo Supercharger: Although technically not a supercharger in the traditional sense, when installed on a small block Chevy, it utilizes exhaust gases to spin a turbine and compress air, providing significant power increases.
The Roots supercharger is known for its low-end torque and immediate throttle response, making it popular for street applications. Its design allows for a consistent boost across a wide RPM range, making it suitable for many driving conditions.
Centifugal superchargers are optimal for those seeking high horsepower at higher RPMs, as they build boost progressively, similar to a turbo. They are generally more efficient at higher speeds and can provide significant performance gains when paired with appropriate engine modifications.
The twin-screw supercharger is praised for its efficiency and ability to generate high boost levels with minimal heat increase, making it ideal for applications requiring sustained power. This type also delivers a linear power band, enhancing drivability and responsiveness.
Turbo superchargers, while categorized differently, can be a great option for small block Chevy engines due to their ability to utilize exhaust gases for air compression. This not only improves horsepower but can also enhance fuel efficiency when properly tuned.
What Makes Roots Superchargers Ideal for Small Block Chevy Engines?
Roots superchargers are often considered one of the best supercharger options for small block Chevy engines due to their unique design and performance characteristics.
- Instant Boost: Roots superchargers provide immediate power increase as they deliver a constant flow of air to the engine.
- Simplicity of Installation: The design of Roots superchargers makes them relatively easy to install on small block Chevy engines.
- High Torque Output: These superchargers enhance low-end torque, making them perfect for street and performance applications.
- Durability: Roots superchargers are built to withstand high levels of stress and can handle significant horsepower increases.
- Custom Tuning Options: They can be easily tuned to match the specific performance goals of a small block Chevy engine.
Instant Boost: Roots superchargers are known for their ability to provide instant boost, as they are positive displacement blowers that compress air before it enters the engine. This means that the moment the throttle is opened, the engine receives a surge of air and power, allowing for immediate acceleration and responsiveness.
Simplicity of Installation: The design of Roots superchargers allows for a more straightforward installation process compared to other supercharger types. They typically mount directly to the intake manifold, making it easier for enthusiasts and mechanics to add this performance upgrade without extensive modifications to the engine bay.
High Torque Output: One of the standout features of Roots superchargers is their ability to significantly enhance low-end torque. This is particularly beneficial for small block Chevy engines, as it leads to improved drivability and acceleration from a standstill, making them ideal for both street performance and racing scenarios.
Durability: Roots superchargers are constructed from robust materials that can handle the increased pressure and heat associated with forced induction. Their durability ensures that they can withstand the rigors of high-performance applications, providing reliable performance over time.
Custom Tuning Options: These superchargers offer the flexibility of being tuned to optimize performance based on individual engine setups and driving preferences. This capability allows users to achieve specific performance goals, whether they are looking for maximum horsepower or a balanced street-friendly setup.
When Is a Centrifugal Supercharger the Right Choice for a Small Block Chevy?
The Compact Design feature is vital for small block Chevys, particularly in classic car builds where engine bay space is limited. The streamlined nature of centrifugal superchargers means they can be installed without extensive modifications, preserving the vehicle’s aesthetics and functionality.
Efficient Power Delivery is another reason to choose a centrifugal supercharger, as they minimize parasitic losses compared to other supercharger types. This efficiency translates into better fuel economy and increased performance, especially when the engine is pushed to its limits.
Cost-Effectiveness makes centrifugal superchargers an attractive option for many Chevys, as they offer a great balance between performance gains and budget constraints. For those who want to enhance their vehicle’s power without incurring excessive costs, this type is often the best supercharger for small block Chevy applications.
Customization Options allow enthusiasts to fine-tune their supercharger setup to match their specific performance needs. By selecting different pulleys and making adjustments to the engine’s tuning, owners can optimize the supercharger’s performance for either street use or track applications.
What Advantages Do Twin-Screw Superchargers Provide for Small Block Chevy?
The advantages of twin-screw superchargers for small block Chevy engines include improved efficiency, higher power output, and better throttle response.
- Improved Efficiency: Twin-screw superchargers are designed to compress the air more efficiently than other types of superchargers. This means that they can generate more boost with less energy consumption, leading to better overall engine performance and fuel economy.
- Higher Power Output: These superchargers can significantly increase the horsepower and torque of a small block Chevy. By providing a consistent and reliable boost across a wide RPM range, they allow for substantial power gains, making them ideal for both street and track applications.
- Better Throttle Response: Twin-screw superchargers offer instantaneous boost, which results in quicker throttle response. This immediate power delivery enhances the driving experience, as the engine reacts more promptly to accelerator inputs, making the vehicle feel more agile and responsive.
- Compact Design: The compact nature of twin-screw superchargers allows for easier integration into the engine bay of a small block Chevy. This can be particularly beneficial in tight spaces or for those looking to maintain a cleaner engine layout without excessive modifications.
- Less Heat Generation: Compared to centrifugal superchargers, twin-screw units generate less heat during the compression process. This results in cooler intake air temperatures, which can improve engine efficiency and reliability, as well as reduce the risk of detonation.
What Performance Improvements Can You Expect After Installing a Supercharger on Your Small Block Chevy?
While superchargers are typically associated with increased fuel consumption due to higher power outputs, they can also lead to better fuel efficiency when driven conservatively, as the engine can operate more efficiently at optimal air-fuel mixture ratios under load.
Finally, the customization options available with different types of superchargers allow you to adjust your engine’s performance characteristics, whether you prefer quick boosts in power or a more gradual increase in performance. This flexibility can cater to a wide range of driving preferences, from daily commuting to track racing.
What Key Factors Should Influence Your Decision When Selecting a Supercharger for Small Block Chevy?
Boost Level: The boost level refers to the amount of compressed air delivered to the engine, measured in PSI. Higher boost levels can significantly enhance engine performance but may also require internal engine upgrades to handle the increased pressure and heat.
Engine Compatibility: Not all superchargers fit all engine types, so verifying dimensions, mounting points, and other compatibility factors specific to your Small Block Chevy is essential for a seamless installation.
Installation Complexity: Some superchargers come with comprehensive installation kits, while others may require custom fabrication and specialized tools. It’s important to assess your mechanical skills and the time commitment needed for installation when choosing a supercharger.
Cost vs. Performance: A higher-priced supercharger may offer better materials or features, but it’s vital to evaluate whether the performance gains justify the expense. Researching user reviews and performance data can help in making an informed decision.
Reliability and Durability: Selecting a supercharger with a reputation for reliability is critical, as poor-quality components can lead to failures and costly repairs. Look for models that are engineered for long-term use and have been tested under various conditions.
Manufacturer Support: Brands that provide robust customer service and warranty options can offer peace of mind, especially for beginners. Good support can help resolve installation issues or performance concerns that may arise after purchase.
Which Brands Are Most Highly Recommended for Supercharging Small Block Chevy?
The most highly recommended brands for supercharging a Small Block Chevy include:
- Whipple Superchargers: Known for their high efficiency and performance, Whipple superchargers utilize a twin-screw design that provides significant boost at lower RPMs. This results in impressive torque and horsepower gains, making them a popular choice among enthusiasts looking for a reliable power upgrade.
- Edelbrock: Edelbrock offers a range of supercharger kits that are designed for easy installation and compatibility with various Small Block Chevy engines. Their roots-style superchargers are particularly favored for delivering a strong power curve and maintaining excellent drivability, ideal for street and performance applications.
- Procharger: Procharger is recognized for its centrifugal superchargers that offer high horsepower potential and are particularly efficient at higher RPMs. They are designed for users looking for maximum power gains without sacrificing engine reliability, making them a great option for both street and race setups.
- Vortech: Vortech superchargers are known for their compact design and ability to produce substantial boost levels while maintaining low levels of heat. This makes them an excellent choice for Small Block Chevy applications where space is limited but performance is a priority.
- Magnuson Superchargers: Magnuson specializes in TVS superchargers that provide a smooth power curve and excellent throttle response. Their products are engineered for OEM fitment and reliability, making them a suitable choice for those seeking a factory-like installation with increased performance.