fits model: 650.

( Brand: Holley ), ( Manufacturer Part Number: 076651-1RD ), ( Choke Type: Electric ), ( Type: Carburetor ), ( Material: Aluminum )
The Holley 076651-1RD 650 CFM Ultra Double Pumper Carburetor is a high-performance automotive component designed for enthusiasts seeking superior fuel delivery and engine performance. This double pumper carburetor is an upgrade from the single pumper models, providing increased airflow and fuel mixture for higher horsepower and torque output.
The Holley Ultra Double Pumper Carburetor features a 650 CFM (cubic feet per minute) primary venturi, which allows for ample fuel and air intake, crucial for fuel-hungry high-performance engines. The carburetor is equipped with two 11/16-inch double pumps, each driven by a shaft that rotates at a 1:1 ratio. This design ensures consistent fuel delivery, even under high-RPM conditions.
The carburetor is constructed from heavy-duty aluminum, which is both lightweight and durable. Its finish is an attractive polished cast aluminum, which not only looks great but also resists corrosion, ensuring long-term performance. The base plate is also made from cast aluminum, providing excellent heat dissipation and preventing warping.
The Holley 076651-1RD features a dual-feed fuel system, which allows for the use of multiple fuel sources. This dual-feed design allows for the use of a primary fuel source, such as a fuel pump, and a secondary source, such as a fuel injection system. This design provides redundancy and ensures that the engine always has a reliable fuel source.
The carburetor is also equipped with a 1-1/8-inch vacuum secondary, which can be used to control idle speed, chokes, or other vacuum-activated components. The secondary is adjustable, allowing for fine-tuning to meet the specific needs of your engine and driving conditions.
The Holley 076651-1RD 650 CFM Ultra Double Pumper Carburetor is compatible with a wide range of applications, including muscle cars, hot rods, and performance trucks. It is suitable for engines with displacements ranging from 350 to 454 cubic inches, and can be adapted for use with various fuel systems, including EFI and mechanical fuel injection.
The carburetor's bowl is removable, making it easy to clean, service, or adjust. The bowl is also vented, which helps prevent fuel vapor lock in hot weather. The carburetor is compatible with Holley's line of performance accessories, such as their Air Mass Sensors, which can be used to optimize performance and fuel efficiency.
In conclusion, the Holley 076651-1RD 650 CFM Ultra Double Pumper Carburetor is a high-performance, durable, and customizable fuel delivery system. Its dual-pump design, heavy-duty construction, and adjustable features make it an excellent choice for any enthusiast seeking to upgrade their engine's fuel delivery system.
Pros of the Holley 076651-1RD 650 CFM Ultra Double Pumper Carburetor:1. High Flow Rate: With a 650 CFM (cubic feet per minute) flow rate, this carburetor is ideal for high-performance applications, such as muscle cars and hot rods.
2. Fuel Efficiency: The double pump design of this carburetor helps improve fuel efficiency by providing a more precise fuel/air mixture, reducing fuel wastage.
3. Adjustable Features: The carburetor features multiple adjustable features, including an air bleeder, primary and secondary metering, and a high-speed power valve, allowing for fine-tuning to meet specific engine performance needs.
4. Durable Construction: The Holley 076651-1RD is built with high-quality materials, including a billet aluminum body and cast aluminum intake, ensuring long-lasting performance and durability.
Cons of the Holley 076651-1RD 650 CFM Ultra Double Pumper Carburetor:1. Complexity: The double pump design and multiple adjustable features can make this carburetor more complex to install and tune compared to simpler single-pump carburetors.
2. Price: As a high-performance carburetor, the Holley 076651-1RD is more expensive than many standard carburetors, which may be a limiting factor for some budget-conscious buyers.
3. Compatibility: While this carburetor is designed to fit a wide range of applications, it may require certain modifications to fit specific engine configurations, such as custom intake manifolds or throttle linkages.
Conclusion:The Holley 076651-1RD 650 CFM Ultra Double Pumper Carburetor is an excellent choice for high-performance applications, offering a high flow rate, improved fuel efficiency, and adjustable features for fine-tuning. While it is more complex and expensive than many standard carburetors, its durability and performance benefits make it a worthwhile investment for those seeking maximum engine performance.
Recommendation:If you're looking for a high-performance carburetor for your muscle car or hot rod, the Holley 076651-1RD 650 CFM Ultra Double Pumper Carburetor is a solid choice. However, be prepared for a more complex installation and tuning process, and ensure that it is compatible with your specific engine configuration. If budget is a concern, consider alternative options with fewer features, or consider upgrading gradually as your performance needs evolve.
Less than a comparable zinc carburetor. The Ultra Double Pumper Carburetors feature all aluminum construction and are equipped with metering blocks a base plate made from 6061-T6 billet. Manual choke Cable driven, hand operated for precise cold start control. Built in, clear fuel level sight glass for easy, no mess adjustments.
Compatible with GM, Chrysler, and Ford A/T kick down linkage. This is a nice looking part when installed. Shiny with blue anodized billet aluminum metering blocks/base plate for good looks and true gasket sealing. HOLLEY 650 cfm ULTRA DOUBLE PUMPER CARBURETOR PART # 0-76651-1RD WITH DUAL FEED FUEL LINE AND RUSSELL LIQUID FILLED GAUGE.
The clean, polished look coupled with Blue metering blocks and throttle body will certainly set your ride apart whether you are at the show or track. Mechanical secondaries for awesome tire turning performance. MANUAL CHOKE MECHANICAL SECONDARIES model 4150. Ultra Double Pumpers feature an Optimized street/strip calibration that works out-of-the-box.
Double Pumper carburetors are an American icon when it comes to performance. From their roots as the premier carburetor on many factory muscle cars to powering thousands of vehicles across finish line, Double Pumper is a great choice whether you are burning up street or quarter mile.