HOLLEY 6497-6501 Carburetor Secondary Block Cfm 4150 4-BARREL 4777

( Brand: Holley ), ( Type: Double Pumper ), ( Manufacturer Part Number: 6497-6501 )

Review HOLLEY 4150 4-barrel Carburetor Secondary Metering Block Cfm 6501 6497 fits 650

The Holley 6497-6501 4150 4-barrel Carburetor Secondary Block is a high-performance component designed for enthusiasts seeking to enhance the fuel delivery system of their hot rods, muscle cars, or racing applications. This secondary block is specifically engineered to work with the Holley 4150 series 4-barrel carburetors, and it offers an impressive flow rate of 650 cubic feet per minute (CFM).

The Holley 6501 6497 secondary block is crafted from premium billet aluminum, ensuring superior strength, durability, and heat dissipation. Its unique design features four separate fuel passages, each supplying fuel to an individual barrel, ensuring optimal fuel distribution for maximum power and efficiency.

This secondary block is suitable for engines with displacements ranging from small block Chevys to big block Chryslers, and it is compatible with various fuel systems, including EFI (Electronic Fuel Injection) and mechanical fuel pumps. Its large fuel passages and fine-tuned metering rods provide excellent atomization, ensuring a smooth and consistent idle, as well as a powerful and responsive throttle.

Moreover, the Holley 6501 6497 secondary block is designed to work seamlessly with the Holley Ultra Lite or Holley Pro-Jet intake manifolds, providing a direct bolt-on installation process for most applications. Its compact design also allows for easy installation in confined engine compartments, making it an excellent choice for restorations, custom builds, or high-performance applications.

The Holley 6497-6501 4150 4-barrel Carburetor Secondary Block is meticulously machined and inspected to ensure the highest possible quality standards. Its anodized finish not only looks great but also provides an additional layer of protection against corrosion and wear. Overall, this secondary block is an essential upgrade for any enthusiast seeking to maximize the performance potential of their 4-barrel carbureted engine.

The Holley 6497-6501 4150 4-barrel 650 CFM carburetor secondary block, also known as the 6501 or 6497 model, is a popular performance carburetor choice among automotive enthusiasts. Here are some pros and cons that might help you make an informed decision about purchasing this carburetor.

1. High Flow Rate: With a flow rate of 650 CFM, this carburetor is capable of delivering a significant amount of fuel to high-performance engines.

2. Adjustability: Holley carburetors are known for their adjustability, and this model is no exception. It offers a wide range of adjustments, allowing users to fine-tune their engine for optimal performance.

3. Durability: Holley carburetors are built to last, and the 6501 model is no different. It features heavy-duty components, including a billet aluminum base and a cast aluminum body, that can withstand the demands of high-performance applications.

4. Fuel Efficiency: Despite its high flow rate, this carburetor is also known for its fuel efficiency. It is designed to deliver only the amount of fuel necessary for optimal engine performance, reducing fuel waste and improving overall efficiency.

5. Wide Compatibility: This carburetor is compatible with a wide range of applications, including both fuel-injected and carbureted engines, making it a versatile choice for many automotive enthusiasts.

1. Complexity: Holley carburetors, including the 6501 model, can be complex to install and tune. They require a significant amount of time and effort to set up correctly, which may be a deterrent for some users.

2. Cost: Compared to some other carburetors on the market, the Holley 6501 is on the higher end of the price spectrum. This may be a consideration for budget-conscious buyers.

3. Maintenance: Holley carburetors require regular maintenance to keep them running at their best. This includes regular cleaning, adjustments, and replacement of worn parts.

4. Fuel System Upgrades: In some cases, installing this carburetor may require upgrades to the fuel system, such as a larger fuel pump or fuel pressure regulator, which can add to the overall cost and complexity of the project.

In conclusion, the Holley 6501 4-barrel carburetor is a high-performance, adjustable, and durable carburetor that is capable of delivering impressive results for automotive enthusiasts. However, it comes with a complex installation process, a higher cost than some alternatives, and requires regular maintenance. Ultimately, the decision to purchase this carburetor depends on your specific needs, budget, and level of automotive experience. If you are looking for a high-performance carburetor and are willing to invest the time and resources into its installation and maintenance, then the Holley 6501 could be an excellent choice for you. On the other hand, if you are looking for a more budget-friendly or easier-to-install option, there may be other carburetors on the market that better suit your needs.

part # 64976501 prices

• $500.00-$799.95

specifications carbcaddie:

• brand: Holley
• type: Double Pumper
• manufacturer part number: 6497-6501

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• transit: 4-10 Days
• cost: $0.00
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• carrier: USPS

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• rating: 100.0%
• # reviews: 31592

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general carbcaddie:

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

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

offer carbcaddie:

• quantity: 1
• availability: In Stock
• options: Ship-to-home
• started: October 18, 2025
• sold: 0
• best offers: True

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