MAXPEEDINGRODS 1KU5AC Carburetor Quadrajet Vacuum Secondary 4BBL 4MV 1904R 750CFM

( Brand: Maxpeedingrods ), ( Manufacturer Part Number: 1KU5AC ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Cfm: 650/750 ), ( Choke Type: Electric ), ( Compatible Make: For Chevrolet ), ( Compatible Year: 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 ), ( Country Of Origin: China ), ( Engine: 5.0l 305cu, 5.7l 350cu ), ( Features: Constant-vacuum, Down Draft, Quadrajet ), ( Fitment 1: For Quadrajet 4mv ), ( Fitment 2: For Chevy 5.0l 305cu Engine 1980-1989 ), ( Fitment 3: For Chevy 5.7l 350cu 1980-1989 ), ( Fitment Type: Direct Replacement ), ( Items Included: Gasket, Mounting Hardware, O-rings ), ( Manufacturer Warranty: 1 Year ), ( Material: Alloy, Aluminum ), ( Maximum Flow: Cfm ), ( Mounting Flange Type: Spread Bore ), ( Needle Valve: 3.3 ), ( Note: No Instruction Included ), ( Notice: This Is Aftermarket Replcement Part. ), ( Oe/oem Part Number: 1904r, 1906r, 17066422, 17066425, 17066432, 17066493, 17066553, 17066556, 17066563, 17066605, 17080202, 17080204, 17080207, 17080228, 17080274, 17080282, 17080284, 17081282, 17081283, 17081284, 17081285, 17082230, 17065524, 17067256, 17082280, 17082281, 17082282, 17082283, 17082284, 17083282, 17083283, 17084284, 17067258, 17067266, 17067268, 17084285, 17084288, 17084289, 17067280, 17067284, 17067336, 17068501, 17068503, 17068505, 17068587, 17068590, Carburetor, Carburettor, Carburetter, Carb, Carby, 4-barrel Carburetor, 4 Barrel Carburetor, 4 Barrel Carb, Carburetor Electric Choke, 4 Bbl Carburetor, 4 Bbl Carb ), ( Part Type: Intake Fuel System ), ( Type: Carburetor ), ( Universal Fitment: No ), ( Venturi Diameter: 31.7mm )

Review MAXPEEDINGRODS Carburetor For Rochester Quadrajet 4mv Vacuum Secondary 750cfm fits 1980–1989

The Maximum Motorsports 1ku5ac 4-barrel carburetor is a high-performance replacement for original Rochester Quadrajet 4mv vacuum secondary carburetors on 1904r engines with a 750cfm air flow rate and suitable for use in vehicles from 1980-1989.

This carburetor is designed to deliver improved throttle response, increased power, and enhanced fuel efficiency compared to the stock Quadrajet. It features a 4-barrel design with vacuum secondary fuel metering for optimal air-fuel mixture. The 750cfm air flow rate ensures sufficient air intake for larger engines or high-performance applications.

1. AccuFiner fine-tuning system for easy adjustment of idle mixture and base circuit.

2. 0.060" larger primary and secondary throats for increased air flow.

3. 1.25" primary bore for improved low-end torque.

4. 1.40" secondary bore for enhanced mid-range power.

5. Improved fuel pump design for better fuel delivery.

6. High-quality, billet aluminum base and accessory plates for added durability and strength.

This carburetor is also designed with ease of installation in mind. It comes with a number of factory-installed hardware options, including fuel pressure regulator, fuel pump, and accelerator pump. The base gasket and mounting hardware are also included in the package.

The Maximum Motorsports 1ku5ac 4-barrel carburetor is a high-performance upgrade for vehicles with Rochester Quadrajet 4mv vacuum secondary carburetors. It offers improved throttle response, increased power, and enhanced fuel efficiency, making it an excellent choice for those seeking to maximize the performance of their engine.

The Maximum Products 1KU5AC 4-barrel carburetor is a suitable replacement for Rochester Quadrajet 4mv vacuum secondary carburetors, particularly those with a 1904R 750cfm 80-89 designation. Here are some pros and cons to help you make an informed decision about purchasing this carburetor:

1. Increased Horsepower: The 4-barrel design of this carburetor allows for a greater air-fuel mixture, leading to increased horsepower and improved engine performance.

2. Better Fuel Efficiency: The 1KU5AC carburetor is designed to provide better fuel efficiency by optimizing the air-fuel mixture, resulting in improved gas mileage.

3. Easy Installation: This carburetor is a direct replacement for the Rochester Quadrajet 4mv vacuum secondary carburetors, making the installation process relatively straightforward.

4. Improved Idle Stability: The 1KU5AC carburetor features improved idle stability, ensuring a smoother and more consistent idle.

5. Adjustability: The carburetor comes with adjustable features such as idle mixture, main jet, and power valve, providing the user with greater control over engine performance.

1. Higher Cost: The Maximum Products 1KU5AC 4-barrel carburetor tends to be more expensive than a stock Rochester Quadrajet 4mv vacuum secondary carburetor.

2. Complexity: Compared to a single-barrel carburetor, a 4-barrel carburetor is more complex, requiring more maintenance and tuning to optimize engine performance.

3. Potential for Fuel Leaks: During installation, there is a risk of fuel leaks due to the need to connect multiple fuel lines from the carburetor to the engine.

4. Requires Tuning: To achieve optimal engine performance, the 1KU5AC carburetor may require some tuning, which can be a time-consuming process.

The Maximum Products 1KU5AC 4-barrel carburetor is an excellent choice for those seeking increased horsepower, improved fuel efficiency, and smoother engine performance. However, it comes with a higher cost, complexity, and the potential for fuel leaks. Ultimately, the decision to purchase this carburetor depends on your specific needs, budget, and willingness to invest time and effort into maintaining and tuning the carburetor for optimal engine performance.

If you're looking for improved engine performance and don't mind the higher cost, complexity, and potential for fuel leaks, then the Maximum Products 1KU5AC 4-barrel carburetor is a solid choice. However, if you're on a tight budget or prefer a more straightforward installation process, then a stock Rochester Quadrajet 4mv vacuum secondary carburetor may be a better option for you.

Details:

Let your vehicles speed up in a short time, better driving experience. 5.7L Engine 1980 - 1989. Replaces Part Numbers. Compact size, less fuel consumption, energy saving and economical.

Control the speed of engine under stable condition, effective operation. Full physical. As shown in the picture.

Need to tune based on the actual situation. High hardness and corrosion resistance, longer usage life. Guaranteed Fitment Always the correct part. Aftermarket brand new, ensure superior and reliable quality.

1904R, 1906R. 4BBL Carburetor For Rochester Quadrajet 4MV Vacuum Secondary 1904R 750 cfm 80-89. Improve the structure during manufacturing process, high accuracy.

Telephone number. Do not have connector. Package Included. Fast Shipping.

part #: 1ku5ac prices

• $179.10-$447.25

specifications carbcoon:

• for makes: Rochester
• for years: 1980-1989
• brand: Maxpeedingrods
• mpn: 1ku5ac
• california prop 65 warning: California Prop 65 Warning
• cfm: 650/750
• choke type: Electric
• compatible make: For Chevrolet
• compatible year: 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989
• country of origin: China
• engine: 5.0l 305cu, 5.7l 350cu
• features: Constant-vacuum, Down Draft, Quadrajet
• fitment 1: For Quadrajet 4mv
• fitment 2: For Chevy 5.0l 305cu Engine 1980-1989
• fitment 3: For Chevy 5.7l 350cu 1980-1989
• fitment type: Direct Replacement
• items included: Gasket, Mounting Hardware, O-rings
• manufacturer warranty: 1 Year
• material: Alloy, Aluminum
• maximum flow: Cfm
• mounting flange type: Spread Bore
• needle valve: 3.3
• note: No Instruction Included
• notice: This Is Aftermarket Replcement Part.
• oe/oem part number: 1904r, 1906r, 17066422, 17066425, 17066432, 17066493, 17066553, 17066556, 17066563, 17066605, 17080202, 17080204, 17080207, 17080228, 17080274, 17080282, 17080284, 17081282, 17081283, 17081284, 17081285, 17082230, 17065524, 17067256, 17082280, 17082281, 17082282, 17082283, 17082284, 17083282, 17083283, 17084284, 17067258, 17067266, 17067268, 17084285, 17084288, 17084289, 17067280, 17067284, 17067336, 17068501, 17068503, 17068505, 17068587, 17068590, Carburetor, Carburettor, Carburetter, Carb, Carby, 4-barrel Carburetor, 4 Barrel Carburetor, 4 Barrel Carb, Carburetor Electric Choke, 4 Bbl Carburetor, 4 Bbl Carb
• part type: Intake Fuel System
• type: Carburetor
• universal fitment: No
• venturi diameter: 31.7mm

payments carbcoon:

• other
• credit card: Discover
• wallet: Google-pay

shipping carbcoon:

• type: Fixed
• cost: $0.00
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• transit: 4-7 Days
• class: Standard

general carbcoon:

• Car Truck Parts Accessories > Air Fuel Delivery > Carburetors
• condition: New

seller carbcoon:

• city: Rowland height, California
• # reviews: 3806
• rating: 99.7%

offer carbcoon:

• availability: In Stock
• sold: 0
• started: May 14, 2026
• best offers: True
• options: Ship-to-home

returns carbcoon:

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

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