HOLLEY 6118-6478 Carburetor Secondary Block Cfm 4150 4-BARREL 4778

( Brand: Holley ), ( Type: Double Pumper ), ( Manufacturer Part Number: 6118-6478 )

Review HOLLEY 4150 4-barrel Carburetor Secondary Metering Block Cfm 6118 6478 fits 700

Introducing the Holley 6118-6478 4150 4-barrel 4778 CFM Carburetor Secondary Block, a high-performance addition to your engine system. This secondary block is specifically designed for use with Holley's 4150 series 4-barrel carburetors, such as the 6118 model, and provides an increased air flow rate of 4778 CFM.

The Holley 6118-6478 secondary block is manufactured from high-quality aluminum, ensuring durability and longevity. It features four large-diameter bore throats, each capable of handling high fuel flow rates for optimal engine performance. The smooth, polished surfaces of the throats reduce turbulence and promote efficient fuel-air mixture creation.

This secondary block is designed to replace the factory secondary block on select engines and provides several benefits over stock components. With its increased flow rate, the Holley 6118-6478 secondary block delivers more power and torque throughout the RPM range. It also offers improved idle quality and stability, making it an excellent choice for both street and racing applications.

The Holley 6118-6478 4150 4-barrel 4778 CFM Carburetor Secondary Block is easy to install and requires no modification to the factory intake manifold. It is compatible with various engine configurations, including small-block Chevy, Ford, and Chrysler applications.

In summary, the Holley 6118-6478 4150 4-barrel 4778 CFM Carburetor Secondary Block is an essential upgrade for any engine seeking enhanced power output, improved idle quality, and increased fuel flow. Its durable construction, large-diameter bore throats, and compatibility with various applications make it a versatile and valuable addition to any performance engine system.

The Holley 6118-6478 4150 4-barrel 4778 carburetor secondary block, with a 700 CFM flow rate, is a popular choice among automotive enthusiasts for high-performance applications. Here are some pros and cons associated with purchasing this carburetor:

1. High Air Flow: This carburetor offers a high air flow rate, making it suitable for larger engines or those requiring more fuel and air mixture.

2. Improved Performance: The secondary block design improves the carburetor's performance by providing more fuel for better atomization and combustion.

3. Adjustability: Holley carburetors are known for their adjustability, allowing users to fine-tune the mixture for optimal performance.

4. Durability: Holley carburetors are built to last, with high-quality materials and construction.

5. Availability of Accessories: Holley offers a wide range of accessories, such as vacuum secondary kits, power valves, and fuel pressure regulators, to enhance the carburetor's functionality.

1. Complexity: Holley carburetors, especially those with secondary blocks, can be complex to install and tune, requiring a good understanding of carburetor theory and operation.

2. Cost: This carburetor is more expensive than some other options on the market.

3. Requires Regular Maintenance: Carburetors, in general, require regular maintenance to ensure optimal performance.

4. Fuel Efficiency: Carburetors, in comparison to fuel injection systems, are less efficient in delivering fuel, which can lead to poor fuel economy.

The Holley 6118-6478 4150 4-barrel 4778 carburetor secondary block is a high-performance carburetor suitable for larger engines or those requiring more fuel and air mixture. Its adjustability, durability, and availability of accessories make it a popular choice among automotive enthusiasts. However, its complexity, cost, and the need for regular maintenance are important considerations before making a purchase. Ultimately, if you're looking for a high-performance carburetor and are willing to invest the time and resources into its installation and tuning, this Holley carburetor could be an excellent choice for your project.

Before making a purchase, it's essential to ensure that this carburetor is compatible with your engine and that you have the necessary skills and resources to install and tune it. It's also a good idea to consider the cost of the carburetor, the cost of installation and tuning, and the potential fuel efficiency trade-offs. If you're confident that this carburetor is the right choice for your project and have the necessary resources, then it's a worthwhile investment for high-performance applications.

part # 61186478 prices

• $40.00-$782.99

specifications carbcaddie:

• for models: 700
• brand: Holley
• type: Double Pumper
• manufacturer part number: 6118-6478

offer carbcaddie:

• availability: In Stock
• best offers: True
• sold: 0
• started: January 9, 2026
• options: Ship-to-home
• quantity: 1

payments carbcaddie:

• credit card: Diners-club
• other
• wallet: Apple-pay

returns carbcaddie:

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

seller carbcaddie:

• rating: 100.0%
• # reviews: 32714

general carbcaddie:

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

shipping carbcaddie:

• transit: 4-11 Days
• class: Standard
• type: Calculated
• carrier: USPS
• service: USPS Ground Advantage
• cost: $0.00

Holley 6118-6478 Is Similar To:

• Ford D0of-9510-n 1970 Cobra Jet 429 Scj Manual 4 Speed Holley Carburetor List 4627 As Is (24.9% similar) $223.99–$2672.99. (August 23rd, 2024)
• Holley 12r-5204b Carburetor Throttle Base Plate #0559 (40.8% similar) $30.00–$59.99. (August 23rd, 2024)
• Holley 12r-4251b Carburetor Throttle Base Plate #0574 (42.3% similar) $24.95–$57.88. (August 23rd, 2024)
• Holley 3887686 2 Bbl 500 Cfm Marine Carburetor Volvo Penta 4.3l For Parts Or Rebuild (38.2% similar) $159.99–$299.95. (August 23rd, 2024)
• Holley 34r-2460-b Secondary Fuel Bowl Side Hung 4150 4160 Adjustable 1850 9834 (41.9% similar) $25.00–$225.00. (August 24th, 2024)
• Holley 36-181 Carburetor Metering Jet 2 Of Each Size Contact Prior Ordering (45.1% similar) $94.99–$99.89. (August 24th, 2024)
• Holley 5583-4519 1968 1969 Metering Plate 5583 For 4053 4346 Chevelle Camaro 396 427 Copo (37.1% similar) $54.09–$1319.99. (August 24th, 2024)
• Holley 8485-1947 Primary Front Metering Block 18502 600 Vacuum Secondary Carburetor (44.2% similar) $49.99–$200.00. (August 24th, 2024)
• Holley 7115 Primary Front Metering Block 6510 Spread Bore 650 Vacuum Dp (45% similar) $975.00–$6950.00. (August 24th, 2024)
• Holley 37-119 Model 4160 4 Barrel 600 Cfm Carb Rebuild Kit (39.5% similar) $28.99–$48.99. (August 25th, 2024)
• Holley 37-1536 Carburetor Renew Kit 4160 (43.4% similar) $170.95. (August 25th, 2024)