HOLLEY R2687 Carburetor Mystery Performance 6A4

( Brand: Holley ), ( Type: Carburetor ), ( Manufacturer Warranty: No Warranty ), ( Fitment Type: Direct Replacement ), ( Manufacturer Part Number: R2687 ), ( Mounting Hardware Included: No ), ( Universal Fitment: Yes ), ( Country Of Origin: United States )

Review HOLLEY Carburetor List 2687 Date 6a4 Chevy Mystery Hi Performance fits 427

The Holley R2687 carburetor is a high-performance, four-barrel fuel delivery system designed specifically for 1965-1969 Chevrolet 283ci, 307ci, and 327ci engines with SAE net horsepower ratings between 300 and 500 hp. This carburetor is part of Holley's Classic Series, which combines classic appearance with modern performance.

The Holley R2687 features a unique design with a traditional appearance, including a polished aluminum base and domed aluminum intake manifold. The carburetor is equipped with four 780 CFM Holley Street Avenger double-pumper carburetor bodies. These bodies provide excellent vacuum secondaries for improved idle quality and drivability.

The Holley R2687 comes with a 650 CFM primary venturi and 780 CFM secondary venturis, ensuring optimal fuel delivery for various engine conditions. The carburetor includes Holley's proven vacuum secondary system, which provides smooth, predictable power delivery and excellent drivability.

This carburetor is designed for ease of tuning and installation. It comes with an adjustable power valve, which allows fine-tuning of the fuel/air mixture for optimal engine performance. The Holley R2687 also features a built-in accelerator pump, which provides additional fuel during hard acceleration for quicker response.

The Holley R2687 is compatible with various fuel systems, including returnless and return-style fuel systems. It comes with a 1/2" NPT fuel inlet and 1/4" NPT fuel outlet. The carburetor also includes a built-in fuel pressure regulator, which ensures accurate fuel pressure for optimal engine performance.

The Holley R2687 also comes with a high-performance air cleaner assembly, which includes a replaceable filter and a polished aluminum air cleaner lid. The carburetor includes all necessary mounting hardware for a straightforward installation process.

Overall, the Holley R2687 carburetor is a high-performance, easy-to-tune fuel delivery system that delivers excellent power and drivability for your 1965-1969 Chevrolet engine. Its classic appearance is sure to please traditional hot rod enthusiasts, while its modern performance features ensure optimal engine performance.

The Holley R2687 carburetor, also known as the 6-71 Double Pumper, is a popular choice among hot rod and performance enthusiasts for powering large engines, particularly those used in Chevy Mystery 427 applications. This carburetor offers several advantages but also comes with some potential drawbacks.

1. Large CFM Capacity: The Holley R2687 carburetor delivers an impressive airflow of 1,150 CFM, which is more than sufficient for large engines like the Mystery 427.

2. Dual Four-Barrel Design: The double pumper design allows for improved fuel delivery and better engine response, which is essential for high-performance applications.

3. Flex Fuel Capable: This carburetor is compatible with both gasoline and E85 fuel, making it a versatile choice for those who want the flexibility to use different fuel types.

4. Adjustable Features: The Holley R2687 comes with many adjustable features, including primary and secondary metering rods, idle mixture screws, and a vacuum secondary option.

1. Complexity: The dual four-barrel design and numerous adjustments can make the installation and tuning process more challenging than a single carburetor, requiring more time and expertise.

2. Fuel Consumption: Due to its large CFM capacity and high fuel delivery requirements, the Holley R2687 carburetor may consume more fuel than a smaller carburetor, leading to increased costs.

3. Cost: Compared to some other carburetors on the market, the Holley R2687 can be quite expensive, making it a significant investment.

The Holley R2687 carburetor offers several advantages for those seeking high airflow and improved engine response for their large engine applications, particularly in Chevy Mystery 427 builds. However, its complexity, fuel consumption, and cost may deter some enthusiasts. Ultimately, the decision to invest in a Holley R2687 carburetor depends on your specific requirements, expertise, and budget.

If you are looking for a high-performance carburetor for your large engine application, and you have the necessary expertise and resources to install and tune it, the Holley R2687 could be an excellent choice. On the other hand, if you are new to carburetor tuning or prefer a more straightforward and cost-effective option, you might want to consider other single-barrel or smaller dual-barrel carburetors instead.

part # r2687 prices

• $53.95-$78.00

specifications carbcaddie:

• for models: 427
• for makes: Chevy
• brand: Holley
• type: Carburetor
• manufacturer warranty: No Warranty
• fitment type: Direct Replacement
• manufacturer part number: R2687
• mounting hardware included: No
• universal fitment: Yes
• country of origin: United States

returns carbcaddie:

• policy: No Returns

offer carbcaddie:

• options: Ship-to-home
• sold: 0
• availability: In Stock
• quantity: 1
• best offers: True
• started: November 12, 2025

payments carbcaddie:

• wallet: Apple-pay
• credit card: Mastercard
• other

seller carbcaddie:

• rating: 100.0%
• # reviews: 1487

general carbcaddie:

• Car Truck Parts Accessories > Air Fuel Delivery > Carburetor Parts
• condition: For parts or not working

shipping carbcaddie:

• cost: $20.00
• service: USPS Priority Mail
• class: Expedited
• type: Fixed
• transit: 5-10 Days
• carrier: USPS

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