BIG A 66-502 Carburetor Rebuild Kit TOMCO-5186C 4-BBL 4MV

( Brand: Big A ), ( Part Type: Carburetor ), ( Manufacturer Part Number: 66-502 ), ( Ipn: Tomco-5186c )

Review BIG A Carburetor Rebuild Kit Chevrolet Rochester 4mv fits 1969–1972

Introducing the Big 66-502 Carburetor Rebuild Kit, specifically designed for 1969 to 1972 Chevrolet Rochester 4-bbl 4CV and 4-bbl 2V carburetors. This comprehensive rebuild kit comes with all the essential components needed to restore your carburetor to its original performance.

The heart of this kit is the high-quality, reconditioned boat-tail intake manifold. It features precision-machined ports for optimal fuel delivery and is designed to provide excellent airflow to the carburetor. Each manifold is thoroughly inspected for any signs of cracks or damage before being included in the kit.

The kit includes a set of new gaskets, ensuring a proper seal between all components. These gaskets are made from high-temperature, resilient material to withstand the rigors of engine operation and provide excellent sealing performance.

1. New float bowls and floats: Designed to provide accurate fuel delivery and prevent leaks, these components are essential for proper carburetor function.

2. New needles and jets: Properly sized and calibrated, these parts ensure precise fuel metering and optimal air-fuel mixture.

3. New idle mixtures: These components help maintain consistent idle speeds and ensure smooth engine operation.

4. New idle mixture screws and clips: These parts secure the idle mixture needles in place and maintain proper idle adjustment.

5. New accelerator pump diaphragms: These parts control the flow of fuel during acceleration, allowing for smooth transitions between idle and wide-open throttle.

6. New accelerator pump plungers: These components help move fuel from the pump to the carburetor during acceleration.

7. New accelerator pump gaskets: These gaskets seal the accelerator pump to the carburetor body and prevent leaks.

8. New idle mixture screw gaskets: These gaskets seal the idle mixture screws to the carburetor body and prevent leaks.

9. New throttle shaft bushings: These bushings help maintain proper throttle shaft alignment and prevent unwanted play.

10. New throttle shaft gaskets: These gaskets seal the throttle shaft to the carburetor body and prevent leaks.

11. New throttle plates: These components control the flow of air to the engine and are crucial for proper engine performance.

12. New throttle plate gaskets: These gaskets seal the throttle plates to the carburetor body and prevent leaks.

13. New idle mixture screws: These screws help set the idle mixture and maintain consistent idle speeds.

14. New idle mixture needle valves: These components control the fuel mixture during idle and help establish smooth engine operation.

15. New float needles: These components help maintain the correct fuel level in the float bowls and ensure proper fuel delivery.

16. New main jets: These jets control the fuel flow to the engine during cruising speeds.

17. New emulsion tubes: These tubes mix fuel and air before it enters the engine cylinders.

18. New power valve and power valve seat: These components help control engine power and provide smooth acceleration.

19. New accelerator pump: This component controls the flow of fuel during acceleration and helps maintain proper engine performance.

20. New accelerator pump diaphragms: These diaphragms help control the flow of fuel during acceleration and prevent leaks.

21. New accelerator pump plungers: These components help move fuel from the pump to the carburetor during acceleration.

22. New accelerator pump gaskets: These gaskets seal the accelerator pump to the carburetor body and prevent leaks.

23. New idle mixture needle valve gaskets: These gaskets seal the idle mixture needle valves to the carburetor body and prevent leaks.

With this Big 66-502 Carburetor Rebuild Kit, you can restore your 1969 to 1972 Chevrolet Rochester 4-bbl 4CV or 2V carburetor to its original performance level. Each component is carefully selected and inspected to ensure the highest quality and optimal performance. By following the included instructions and using the provided parts, you can confidently rebuild your carburetor and enjoy improved engine power and fuel efficiency.

Buying a 66-502 carburetor rebuild kit for a 1969-1972 Chevrolet Rochester 4-bbl 4mv engine involves considering both advantages and disadvantages. Here's a breakdown of each:

1. Cost-Effective: Rebuilding an existing carburetor is generally less expensive than purchasing a new one. A rebuild kit provides all the necessary components to restore the carburetor to its original condition.

2. Customizability: Rebuilding a carburetor using a kit allows for customization based on specific engine requirements or performance goals. This can result in improved engine performance and fuel efficiency.

3. Environmental Impact: Rebuilding a carburetor reduces the demand for manufacturing new ones, which contributes to a smaller carbon footprint.

4. Availability: Older carburetors can be difficult to find new, but rebuild kits are often readily available from various manufacturers.

5. Satisfaction: Rebuilding a carburetor is a hands-on project that can provide a sense of accomplishment and pride in restoring a vehicle's original components.

1. Time-Consuming: Rebuilding a carburetor can be a time-consuming process, especially for those without prior experience. The project may require multiple attempts to get it right.

2. Skill Level: Rebuilding a carburetor requires a certain level of mechanical expertise. Inexperienced individuals may find the process frustrating or may not achieve the desired results.

3. Potential for Damage: During the rebuild process, there is a risk of damaging delicate components, which could result in additional costs or the need for replacement parts.

4. Ongoing Maintenance: Rebuilt carburetors may still require periodic maintenance to ensure optimal performance.

Weighing the advantages and disadvantages, it appears that rebuilding a 1969-1972 Chevrolet Rochester 4-bbl 4mv carburetor using a 66-502 rebuild kit can be a cost-effective, customizable, and satisfying solution for those with the necessary skills and time. However, the time-consuming and potentially damaging nature of the project should be carefully considered before embarking on the endeavor.

If you possess the necessary skills and are willing to invest the time, a 66-502 rebuild kit for your 1969-1972 Chevrolet Rochester 4-bbl 4mv carburetor can be an excellent choice. However, if you lack experience or time, it may be more practical to consider purchasing a rebuilt or new carburetor from a trusted source.

part # 66502 prices

• $149.00-$549.99

specifications carbcaddie:

• for makes: Chevrolet, Rochester
• for years: 1969-1972
• brand: Big A
• part type: Carburetor
• manufacturer part number: 66-502
• interchange part number: TOMCO-5186C

offer carbcaddie:

• started: October 31, 2025
• quantity: 1
• sold: 0
• options: Ship-to-home
• availability: In Stock

shipping carbcaddie:

• carrier: USPS
• class: Standard
• transit: 4-7 Days
• service: USPS Ground Advantage
• type: Fixed
• cost: $0.00

payments carbcaddie:

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

returns carbcaddie:

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

seller carbcaddie:

• # reviews: 252008
• rating: 99.5%

general carbcaddie:

• condition: New other see details
• Car Truck Parts Accessories > Air Fuel Delivery > Carburetor Parts

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