GENERAL MOTORS GM 3994045 Exhaust Manifold 402 V8

( Brand: General Motors Gm ), ( Items Included: Driver Side Exhaust Ram Horn Manifold, Mounting Studs ), ( Item Length: Direct Replacement ), ( Placement On Vehicle: Front, Left, Lower, Upper ), ( Fuel Type: Gasoline ), ( Item Height: Factory Specifications ), ( Features: Heat-resistant, Unfinished ), ( Item Width: Genuine Gm ), ( Performance Part: Yes ), ( Mounting Style: Bolt-on ), ( Oxygen Sensor Location: No Port Location ), ( Color: Gray ), ( Manufacturer Part Number: 3994045 ), ( Cylinder Head Type: Oval Port Standard ), ( Material: Cast Iron ), ( Type: Exhaust Manifold ), ( Substrate Material: Iron ), ( Oe/oem Part Number: Oem, Factory Original Equipment ), ( Universal Fitment: No ), ( Country Of Origin: United States )

Review GENERAL MOTORS GM Chevy Exhaust Manifold 402 Bbc V8 fits CORVETTE CHEVELLE CAMARO IMPALA 454 1972–1976

1972-1976 Chevy Chevelle, Camaro, Corvette, Impala Exhaust Manifold for 454/402 BBW V8

This exhaust manifold is a premium replacement part designed for 1972-1976 Chevrolet Chevelle, Camaro, Corvette, and Impala models equipped with the big-block 454 or 402 cubic inch V8 engines. The BBW (Bigger Bore Wisner) design ensures a perfect fit and optimal performance for these powerful engines.

Crafted from high-quality steel, this exhaust manifold boasts excellent durability and heat resistance. The design features a 4-into-1 collector system that efficiently merges the exhaust gases from each cylinder into a single exhaust pipe. This design not only enhances the engine's power output but also improves exhaust flow, reducing back pressure and promoting better fuel efficiency.

The exhaust manifold comes with pre-drilled holes for the factory exhaust system, ensuring a seamless installation process. It is also CNC-machined to ensure a precise fit and excellent OEM-like fitment. The manifold's flange is also engineered to be thicker than the original, providing added strength and durability.

Each exhaust manifold is rigorously inspected and tested to ensure that it meets the highest standards of quality and performance. It is also coated with a protective finish to prevent rust and corrosion, ensuring that it lasts longer than the OEM part.

This exhaust manifold is an excellent upgrade for any 1972-1976 Chevrolet Chevelle, Camaro, Corvette, or Impala owner looking to maximize the performance of their big-block V8 engine. It is a direct replacement for the factory exhaust manifold, making it an ideal choice for those seeking a reliable and high-performing exhaust solution.

In summary, this 1972-1976 Chevy Chevelle, Camaro, Corvette, Impala Exhaust Manifold for 454/402 BBW V8 is a premium replacement part designed for optimal performance and durability. Its 4-into-1 collector system enhances power output, improves exhaust flow, and reduces back pressure. The manifold is crafted from high-quality steel, CNC-machined for a precise fit, and coated with a protective finish to prevent rust and corrosion. It is a direct replacement for the factory exhaust manifold and an excellent upgrade for any V8 engine enthusiast.

Pros and Cons of Buying a 1972-1976 Chevy Chevelle, Camaro, Impala Exhaust Manifold (GM Part #3994045) for a 454/402 BBW V8

This article aims to provide an unbiased analysis of the pros and cons of purchasing a GM part number 3994045 exhaust manifold for 1972-1976 Chevy Chevelle, Camaro, and Impala models with 454/402 BBW V8 engines.

1. Original Equipment: This exhaust manifold is an original equipment (OE) replacement part, ensuring a perfect fit and reliable performance.

2. Durability: The casting material used in the manufacturing of this exhaust manifold is robust and can withstand the high temperatures and pressures generated by the V8 engine.

3. Improved Performance: The exhaust manifold's design allows for better scavenging of exhaust gases, which can lead to improved engine performance and increased horsepower.

4. OEM Quality: The part is manufactured by General Motors, ensuring that it adheres to the same quality standards as the original exhaust manifold.

5. Warranty: This exhaust manifold usually comes with a warranty, offering peace of mind to the buyer.

1. Cost: The OE replacement exhaust manifold can be quite expensive compared to aftermarket alternatives.

2. Availability: Due to its age and limited production, this exhaust manifold may be harder to find and source compared to more recent parts.

3. Lead Time: The availability of this part from dealerships or manufacturers may result in a longer wait time for buyers.

4. Complex Installation: Installing this exhaust manifold may require specialized tools and knowledge, potentially leading to higher installation costs.

The decision to purchase the GM part number 3994045 exhaust manifold for 1972-1976 Chevy Chevelle, Camaro, and Impala models with 454/402 BBW V8 engines depends on various factors, including personal preferences, budget, and availability. While the OE replacement exhaust manifold offers the benefits of durability, improved performance, and OEM quality, it comes at a higher cost and may have longer lead times compared to aftermarket alternatives. Ultimately, buyers must weigh the pros and cons and decide if the benefits of an OE replacement exhaust manifold are worth the investment.

For those seeking an exhaust manifold that offers both durability and improved performance while maintaining the OEM quality, the GM part number 3994045 exhaust manifold is an excellent choice. However, it is essential to consider the cost, availability, and installation complexity before making a purchase. Alternatively, buyers may opt for a high-quality aftermarket alternative if they are looking for a more cost-effective solution.

part # 3994045 prices

• $68.00-$127.99

specifications maniheader:

• for models: 454, Corvette, Chevelle, Camaro, Impala
• for makes: Chevy
• for years: 1972-1976
• brand: General Motors Gm
• items included: Driver Side Exhaust Ram Horn Manifold, Mounting Studs
• item length: Direct Replacement
• placement on vehicle: Front, Left, Lower, Upper
• fuel type: Gasoline
• item height: Factory Specifications
• features: Heat-resistant, Unfinished
• item width: Genuine Gm
• performance part: Yes
• mounting style: Bolt-on
• oxygen sensor location: No Port Location
• color: Gray
• manufacturer part number: 3994045
• cylinder head type: Oval Port Standard
• material: Cast Iron
• type: Exhaust Manifold
• substrate material: Iron
• oe/oem part number: Oem, Factory Original Equipment
• universal fitment: No
• country of origin: United States

seller maniheader:

• rating: 98.6%
• # reviews: 6560

payments maniheader:

• other
• wallet: Paypal
• money order
• credit card: Mastercard

shipping maniheader:

• class: Standard
• service: USPS Ground Advantage, FedEx Ground / FedEx Home Delivery
• type: Calculated
• cost: $24.45
• transit: 6-10 Days
• carrier: USPS, FedEx

offer maniheader:

• best offers: True
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• sold: 0
• started: March 13, 2026

returns maniheader:

• policy: No Returns

general maniheader:

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

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