HOLLEY 7647 Carburetor 1-BARREL 6-CYLINDER

( Brand: Holley ), ( Manufacturer Part Number: 7647 ), ( Type: Economaster ), ( Oe/oem Part Number: 1969 1970 )

Review HOLLEY 1940 1-barrel Carburetor Chevrolet Chevy 6-cylinder fits 250 1968–1971

The Holley 7647 1940 1-barrel carburetor is a legendary performance upgrade for 1968 to 1971 Chevrolet Chevy 250 6-cylinder engines. This carburetor, manufactured by Holley Carburetor LLC, is a mechanical-feed, single-barrel design that delivers reliable and consistent fuel delivery for improved engine performance.

The 7640 series carburetor features a 750 CFM (cubic feet per minute) air flow rating, making it suitable for modest power gains and daily driving. The primary jet size is 0.078 inches, with secondary jet sizes ranging from 0.041 inches to 0.092 inches, allowing for fine-tuning of the fuel mixture for various engine conditions.

This carburetor comes equipped with a Holley's classic design, including a chrome-plated body, brass fuel bowls, and a billet aluminum intake manifold mounting plate. The float bowls are vented to reduce the risk of engine flooding during rapid acceleration or deceleration. The carburetor also includes a power valve, which improves vacuum secondaries performance and enhances low-end torque.

The Holley 7647 1940 1-barrel carburetor comes with a 600 cfm base gasket and a 750 cfm powered port gasket. It is important to note that this carburetor may require the use of Holley's distributorless ignition system or an appropriate HEI (High Energy Ignition) distributor for optimal performance.

Installing the Holley 7647 1940 1-barrel carburetor on your 1968 to 1971 Chevrolet 250 6-cylinder engine requires the use of appropriate mounting hardware, intake manifold, and a suitable air cleaner assembly. Proper tuning and adjustment of the carburetor, including idle mixture, main jet, and secondary mixture settings, is crucial for optimal engine performance.

In summary, the Holley 7647 1940 1-barrel carburetor is an excellent choice for enhancing the fuel delivery and overall performance of your 1968 to 1971 Chevrolet Chevy 250 6-cylinder engine. With its classic design, reliable performance, and adjustability, this carburetor is a worthy investment for any enthusiast seeking to breathe new life into their classic Chevrolet.

Holley 7647 1-barrel carburetor is a popular choice for restoring or upgrading 1968-1971 Chevrolet Chevy 250 6-cylinder engines due to its excellent performance and reliability. However, like any other carburetor, it has its advantages and disadvantages.

1. Improved Performance: Holley carburetors are known for their excellent fuel mixture and airflow delivery, which results in improved engine performance. The 7647 model is no exception, as it offers a larger vacuum secondary than the stock carburetors, providing a more significant power boost.

2. Easy-to-Tune: Holley carburetors are relatively easy to tune, making it an attractive option for enthusiasts who want to customize their engine's performance. The 7647 model comes with a Holley-specific vacuum secondary system, making it easier to set up and tune for optimal performance.

3. High-Quality Construction: Holley carburetors are made of high-quality materials, ensuring durability and longevity. The 7647 model features a heavy-duty cast aluminum body, brass components, and a durable diaphragm, making it a reliable choice for your Chevy 250 engine.

1. Cost: Holley carburetors can be more expensive than stock carburetors, and the 7647 model is no exception. However, the performance and reliability benefits often outweigh the additional cost for enthusiasts.

2. Installation Complexity: Installing a Holley carburetor on a 1968-1971 Chevy Chevy 250 6-cylinder engine can be more complex than a stock carburetor installation. This is due to the additional parts and modifications required to make the Holley carburetor function correctly with the engine.

3. Fuel Economy: Holley carburetors, particularly high-performance ones like the 7647 model, may sacrifice fuel economy for power. If fuel economy is a priority, then a stock or low-performance carburetor might be a better choice.

The Holley 7647 1-barrel carburetor is an excellent choice for enthusiasts looking to improve the performance of their 1968-1971 Chevy Chevy 250 6-cylinder engine. Its advantages include improved performance, easy tuning, and high-quality construction. However, it comes with some disadvantages, such as a higher cost, installation complexity, and potential fuel economy sacrifices. Ultimately, the decision to purchase the Holley 7647 carburetor depends on your priorities, budget, and the level of customization you seek for your Chevy engine.

If you're looking for improved engine performance and don't mind the additional cost and installation complexity, then the Holley 7647 1-barrel carburetor is a solid recommendation for your 1968-1971 Chevy Chevy 250 6-cylinder engine. For those prioritizing fuel economy or a more straightforward installation, a stock or low-performance carburetor might be a better fit.

Details:

See pics for condition. Linkage moves free. Holley 1940 1-barrel carburetor, list number 7647. Please verify part number and pics match your application.

Core for rebuilding or parts.

part #: 7647 prices

• $73.00-$76.00

specifications carbcoon:

• for models: 250
• for makes: Chevrolet, Chevy
• for years: 1968-1971
• brand: Holley
• mpn: 7647
• type: Economaster
• oe/oem part number: 1969 1970

shipping carbcoon:

• type: Calculated
• service: USPS Ground Advantage
• transit: 3-8 Days
• carrier: USPS
• class: Standard
• cost: $0.00

returns carbcoon:

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

payments carbcoon:

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

general carbcoon:

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

offer carbcoon:

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

seller carbcoon:

• city: Sheboygan Falls, Wisconsin
• # reviews: 32210
• rating: 100.0%

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