HOLLEY R84021-3 Holly Barrel Carburetor Spreadbore Spread 3526

( Brand: Holley ), ( Manufacturer Part Number: R84021-3 ), ( Type: Carburetor ), ( Choke Type: Electric ), ( Mounting Flange Type: Spread Bore ), ( Country/region Of Manufacture: United States )

Review HOLLEY Vtg Holly Barrel Carburetor Spreadbore Spread Bore

Introducing the Holley R84021-3 Vintage Series Holley 3526 Spreadbore Street Avenger Carburetor, a high-performance addition to any hot rod or custom vehicle. This vintage-style carburetor is not only a visual delight but also delivers exceptional power and fuel efficiency.

The Holley R84021-3 Carburetor boasts a 3526 spreadbore barrel design that offers increased airflow and improved fuel atomization. The spreadbore barrel is a popular choice for hot rodders seeking enhanced power and torque in their engines. This particular model is suitable for applications using a 350 cubic inch Chevy engine.

The carburetor comes equipped with a 650 CFM Holley Double Pumper Intake Manifold. This intake manifold is designed for maximum power and torque, and its dual-plane design ensures excellent intake velocity for optimal engine performance. The manifold is also equipped with Holley's proven high-performance intake ports and runners.

The Holley R84021-3 Carburetor features a traditional Holley design with a smooth, polished finish and chrome accents. The fuel bowls are glass-packed with Holley's exclusive Micronite Filter Felt, which ensures clean fuel and eliminates the need for messy fuel filters. The carburetor also includes a convenient sight plug for easy fuel level monitoring.

This carburetor is topped off with a Holley 0-8000 RPM vacuum secondary system. The vacuum secondary system provides excellent mid-range power and torque, making it an ideal choice for street rod applications. The secondary system is adjustable via a single, easy-to-reach screw on the top of the carburetor.

The Holley R84021-3 Vintage Series Holley 3526 Spreadbore Street Avenger Carburetor is also compatible with Holley's electronic fuel injection systems, allowing for easy conversion to electronic fuel injection for improved idle quality and improved drivability.

In summary, the Holley R84021-3 Vintage Series Holley 3526 Spreadbore Street Avenger Carburetor is a high-performance, visually stunning addition to any hot rod or custom vehicle. Its spreadbore barrel design, double pumper intake manifold, and vacuum secondary system deliver exceptional power and torque, while its traditional design and easy-to-use features make it a favorite among hot rodders and custom car enthusiasts.

The Holley R84021-3 Vintage Series 350cfm Spreadbore Carburetor is a popular choice among hot rod and custom car enthusiasts for its classic appearance and reliable performance. Here are some pros and cons to help you decide if this carburetor is the right fit for your project.

1. Authentic Appearance: The R84021-3 carburetor has a vintage look that complements classic hot rods and custom cars. Its spreadbore design and chrome finish add a touch of elegance to any engine bay.

2. Versatile: This carburetor is suitable for various engine sizes and configurations. It can be used on small-block Chevrolet, Ford, and Chrysler engines, among others.

3. Adjustable: The Holley R84021-3 carburetor comes with adjustable features such as the primary and secondary throttle shafts, idle mixture screws, and main jet size. This makes it easier to fine-tune the carburetor for optimal engine performance.

4. Durable: Holley carburetors are known for their durability and reliability. The R84021-3 carburetor is no exception. It is made of high-quality materials and is designed to withstand the rigors of high-performance driving.

5. Easy to Install: Installing the Holley R84021-3 carburetor is relatively straightforward. Holley provides detailed instructions and technical support to make the installation process as smooth as possible.

1. Complexity: Compared to modern carburetors, the Holley R84021-3 carburetor is more complex to tune. It requires a good understanding of carburetion fundamentals and some mechanical skills.

2. Expensive: The Holley R84021-3 carburetor is more expensive than some other options on the market. However, its quality, versatility, and performance may justify the investment.

3. Fuel Economy: Carburetors, in general, are less fuel-efficient than modern fuel injection systems. The Holley R84021-3 carburetor is no exception.

The Holley R84021-3 Vintage Series 350cfm Spreadbore Carburetor is an excellent choice for hot rod and custom car enthusiasts who value authenticity, versatility, and performance. Its classic appearance, adjustable features, durability, and ease of installation make it a popular choice. However, its complexity, high cost, and lower fuel economy may be drawbacks for some. Ultimately, the decision to buy this carburetor depends on your priorities, budget, and technical abilities.

If you're looking for a high-performance, vintage-style carburetor for your hot rod or custom car project, the Holley R84021-3 Vintage Series 350cfm Spreadbore Carburetor is an excellent option. Its authentic appearance, adjustable features, durability, and ease of installation make it worth the investment. However, if you're on a tight budget or prefer a more fuel-efficient option, you may want to consider alternative solutions.

Details:

This is a very nice top quality Spreadbore carb by Holley. It will come exactly as shown.

part #: r840213 prices

• $69.29-$69.95

specifications carbcoon:

• brand: Holley
• mpn: R84021-3
• type: Carburetor
• choke type: Electric
• mounting flange type: Spread Bore
• country/region of manufacture: United States

payments carbcoon:

• credit card: Mastercard
• other
• wallet: Google-pay
• cash

general carbcoon:

• Car Truck Parts Accessories > Air Fuel Delivery > Carburetors
• condition: Used

seller carbcoon:

• rating: 99.4%
• city: Tustin, California
• # reviews: 52775

returns carbcoon:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

shipping carbcoon:

• service: USPS Ground Advantage
• type: Fixed
• class: Standard
• transit: 5-9 Days
• carrier: USPS
• cost: $0.00

offer carbcoon:

• started: June 18, 2025
• availability: In Stock
• sold: 0
• quantity: 1
• options: Ship-to-home

Holley R84021-3 Is Similar To:

• Holley 4557 Ls6 L78 396 454 Carburetor 3967477-gg 1970 Chevelle Camaro Nova (43.2% similar) She was removed off of a running BBC motor but has been sitting for few months. It has not been tested and could possibly need work, labor, other parts/materials before use. May be shipped via ups, USPS or FedEx. The base plate was replaced. Selling an oem Holley list 4557 carburetor with...(May 17th, 2024)
• Holley 10741 Teapot 4000 4-barrel Carburetor 1074-1 Core 1955 Ford Thunderbird 292 V-8 (49.1% similar) Ford part number EYCK-9510-T. Holley teapot 4000 4-BARREL carburetor, list number 1074-1. Please verify part number and pictures match your application. Linkage moves free. See pics for condition. Carb core appears to be mostly complete. Core for rebuilding or parts...(May 17th, 2024)
• Holley 1920 Vintage Glass Bowl Carburetor Hot Rod Gasser Carb Core Rebuild (51.7% similar) Good condition all linkage moves as it should great for rebuild...(May 17th, 2024)
• Holley 06425c Two Barrel 650cfm Carburetor 6425 Imca Cheater Outlaw Racing Core (46.1% similar) Rare Holley two barrel carburetor, list number 6425 - carb is together with choke removed but horn intact metering block also in very nice physical condition, all linkage moves freely kick down arm as well good overall core condition has been sitting fryers it should base and bores look...(May 17th, 2024)
• Holley Ecz-9510-m Teapot 4000 4-barrel Carburetor 1161-2 Carb 1956 Ford Thunderbird 312 V-8 (46.3% similar) Carb core appears to be mostly complete. Core for rebuilding or parts. Holley teapot 4000 4-BARREL carburetor, list number 1161-2. Please verify part number and pictures match your application. See pics for condition. Ford part number CZ-9510-M. Linkage moves free...(May 18th, 2024)
• Holley R3310-1 Carburetor List-3310-1 780cfm H4-4150 4bbl Carb Ford Chevy Bop Mopar (39.7% similar) Used Holley 780 cfm 4BBL carburetor. Being sold for parts, restoration, core, rebuild. Looks to be complete, no cracks, being sold as/is. LIST-3310-1, date, 0653...(May 18th, 2024)
• Holley 1850-3 Carburetor 4 Barrel 600 Cfm Vac Secondary Nice Rebuildable Core (41.3% similar) Many of the carbs have been rebuilt and were sitting in plastic bags, but I no history on what was done to them. It is missing a part of the electric choke. Very nice and clean vintage. Spectre fuel system accessory carburetor. The rest of it looks complete. 600 cfm vac...(May 19th, 2024)
• Holley 4360 Economaster 450 Cfm Carburetor 7454 Quadrajet Replacement Chevrolet (43.4% similar) List number is 7454. For sale is one 1 used Holley 4360 series 450 cfm spread bore carburetor. Verify it will fit your application prior to purchasing. Please look closely at all the pictures for condition and details. The carb is in poor shape and for parts only...(May 19th, 2024)
• Holley List-7001 4165 Spreadbore Carburetor 650cfm Core Or Parts (41.7% similar) This model is a spreadbore design double pumper with two accelerator pumps. You are buying on a Holley model 4165 four-barrel carburetor, stamped p/n # LIST-7001, date code 1610, rated at 650 cfm ...(May 19th, 2024)
• Holley 4779 4150 4779 750cfm Competition Drag Racing Double Pumper Carburetor (32% similar) Holley 4150/4779/750C FM, competition drag racing double pumper carburetor. Is totally rebuilt, is in like new condition, and ready to install. This is an actual photo of the carb...(May 19th, 2024)
• Holley 1850-1 Used 4 Barrel Carburetor List 0618 600cfm Electric Choke Vacum Sec (51% similar) List 1850-1 0618 universal fit...(May 19th, 2024)