GM 3964243 Big Block Exhaust Manifold 3864243 402

( Brand: Gm ), ( Type: Exhaust Manifold ), ( Manufacturer Part Number: 3964243 )

Review GM Chevy Big Block Bbc Truck Exhaust Manifold 402 fits 366 427 396 454

The GM 3964243 Chevy Big Block BBK 366 427 exhaust manifold is a high-performance aftermarket part designed for use in various Chevrolet engines, including those with displacements of 366 cubic inches (5.9L), 427 cubic inches (7.0L), and larger 396, 402, and 454 cubic inch (7.3L, 6.7L, and 7.5L) engines. This exhaust manifold is part of the BBK (Borowski Performance Exhaust) system, which is renowned for its superior engineering and durability.

The exhaust manifold is engineered using advanced technologies and materials, ensuring optimal exhaust flow and maximum power output. It features a robust design with heavy-duty, high-strength steel construction, ensuring reliability and longevity. The exhaust ports are precision-machined for a perfect fit and optimal exhaust flow, maximizing performance and efficiency.

The manifold's primary tubes are designed with a large diameter and a smooth, flowing cross-section, reducing exhaust backpressure and increasing power output. It also features long-lasting, high-temperature ceramic coating on the exterior, protecting the manifold from heat damage and providing a professional, polished appearance.

This exhaust manifold is a direct-fit replacement for the factory unit and comes with all necessary hardware for installation. The design is compatible with various headers and exhaust systems, allowing for flexibility in customization and ease of integration into various engine setups.

In summary, the GM 3964243 Chevy Big Block BBK 366 427 exhaust manifold is a top-tier aftermarket part designed to enhance the performance and durability of your Chevrolet engine. With its superior engineering, robust design, and ease of installation, it is an excellent addition for any serious performance enthusiast or professional race team.

Pros and Cons of Buying a Chevy Big Block BBK Exhaust Manifold (GM Part Number 3964243)

The Chevy Big Block BBK Exhaust Manifold (GM Part Number 3964243) is a popular aftermarket performance part for engines such as 366, 402, 427, and 454. In this analysis, we will discuss the potential advantages and disadvantages of purchasing this exhaust manifold.

1. Improved Performance: The BBK (Breathed Through the Bedpan) design of this exhaust manifold allows for better scavenging of exhaust gases, which can lead to improved engine performance, increased horsepower, and better throttle response.

2. Durability: This exhaust manifold is made from high-quality materials that can withstand the extreme temperatures and pressures generated by high-performance engines, ensuring long-lasting durability.

3. Fitment: The 3964243 exhaust manifold is a direct replacement for the original factory manifold, making for a straightforward and hassle-free installation process.

4. Enhanced Sound: The BBK design also produces a more aggressive exhaust note, making for an exhilarating driving experience.

1. Cost: The Chevy Big Block BBK Exhaust Manifold (GM Part Number 3964243) is a premium aftermarket performance part, and its price may be prohibitive for some buyers.

2. Modification: Installing the BBK exhaust manifold may require additional modifications to the engine or exhaust system to ensure proper fitment and function, adding to the overall cost and complexity of the project.

3. Noise: The more aggressive exhaust note produced by the BBK design can be quite loud, which may not be suitable for all driving situations or noise regulations.

4. Maintenance: The high-performance nature of this exhaust manifold may require more frequent maintenance, such as more frequent spark plug changes or oil changes, to ensure optimal performance.

The Chevy Big Block BBK Exhaust Manifold (GM Part Number 3964243) offers significant performance benefits, including improved power, durability, and enhanced sound. However, its high cost, potential need for additional modifications, and increased noise level are important considerations. Ultimately, the decision to purchase this exhaust manifold depends on the individual's budget, performance goals, and driving preferences.

If you are looking for a high-performance exhaust manifold for your Chevy Big Block engine and have the budget for it, the 3964243 BBK exhaust manifold is an excellent choice. Its performance benefits and long-lasting durability make it a worthwhile investment for serious enthusiasts. However, if you are on a tighter budget or prefer a more subtle driving experience, you may want to consider alternative options.

part # 3964243 prices

• $52.00-$125.00

specifications maniheader:

• for models: 366, 427, 396, 454
• for makes: Chevy
• brand: Gm
• type: Exhaust Manifold
• manufacturer part number: 3964243

offer maniheader:

• quantity: 1
• options: Ship-to-home
• best offers: True
• availability: In Stock
• sold: 0
• started: January 15, 2026

general maniheader:

• condition: Used
• Car Truck Parts Accessories > Exhaust Emission Systems > Manifolds Headers

seller maniheader:

• # reviews: 127
• rating: 100.0%

returns maniheader:

• policy: No Returns

payments maniheader:

• other
• credit card: Diners-club
• wallet: Paypal

shipping maniheader:

• cost: $35.00
• service: FedEx Ground Economy
• carrier: FedEx
• transit: 5-11 Days
• class: Economy
• type: Fixed

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