1957–1964 Chevrolet Impala, Bel Air, 150, 210, Biscayne & Delray NOS RH Exhaust Manifold #3817806 (Cast 3750556)

Available for sale is a genuine General Motors New Old Stock (NOS) Right-Hand Exhaust Manifold, GM part number 3817806, casting number 3750556, designed for select 1957–1964 Chevrolet passenger car applications including Impala, Bel Air, 150, 210, Biscayne, and Delray models equipped with 283ci and 327ci V8 engines (various specific configurations).

This original GM service replacement component is a highly desirable and increasingly hard-to-find part for restorers seeking factory-correct exhaust system components for classic Chevrolet small-block V8 vehicles.

The late 1950s through mid-1960s Chevrolet passenger car lineup represents one of the most iconic eras in American automotive history. Vehicles such as the Impala, Bel Air, and Biscayne helped define the full-size Chevrolet segment, while the introduction of the 283 and later 327 cubic inch V8 engines marked a major advancement in Chevrolet performance and reliability.

The right-hand exhaust manifold is a critical component of the engine’s exhaust system. It collects exhaust gases from the right cylinder bank and directs them into the exhaust system for proper flow and engine efficiency. A correctly functioning manifold is essential for maintaining proper backpressure, engine performance, and exhaust system integrity.

Over time, original exhaust manifolds can develop cracks, warping, corrosion, or mounting flange damage due to repeated heating and cooling cycles. These issues can lead to exhaust leaks, reduced engine performance, noise, and improper air-fuel balance.

This component is a true New Old Stock (NOS) GM service replacement part, meaning it was manufactured during the original production era and has never been installed on a vehicle. It retains original factory specifications, casting quality, and engineering design intended for correct fitment and long-term durability.

Unlike many aftermarket or reproduction exhaust components, NOS GM manifolds provide authentic casting detail, correct port alignment, and original metallurgy. This is especially important for restorers seeking factory-correct appearance and performance in classic Chevrolet V8 engines.

For restorers, maintaining correct exhaust system components is essential for both authenticity and proper engine operation. Whether restoring a lowrider Impala, a factory SS model, or a restored Biscayne or Bel Air sedan, this manifold helps preserve original performance and factory-correct configuration.

As original GM small-block V8 exhaust components become increasingly difficult to locate, NOS manifolds such as this have become highly sought after by collectors, restoration specialists, and classic Chevrolet enthusiasts.

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Product Features

• Genuine General Motors New Old Stock (NOS) part
• GM Part Number: 3817806
• Casting Number: 3750556
• Right-Hand Exhaust Manifold
• Designed for select 1957–1964 Chevrolet V8 applications
• Fits Impala, Bel Air, 150, 210, Biscayne, Delray models (various configurations)
• Compatible with 283ci and 327ci engines (specific applications)
• Factory-correct exhaust system component
• Supports proper exhaust flow and engine performance
• Original GM service replacement part
• Never installed on a vehicle
• Rare small-block Chevrolet exhaust component

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Vehicle Compatibility

Fits select Chevrolet applications:

• 1957–1964 Chevrolet Impala
• 1957–1964 Chevrolet Bel Air
• 1957–1964 Chevrolet 150
• 1957–1964 Chevrolet 210
• 1958–1964 Chevrolet Biscayne
• 1962–1964 Chevrolet Delray
• Select 283ci V8 applications
• Select 327ci V8 applications

Compatibility may vary depending on engine configuration, emissions setup, and chassis specifications. Buyers should verify fitment before purchase.

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Condition

This component is offered in New Old Stock (NOS) condition. It has never been installed and remains an original GM service replacement part. Due to decades of storage, minor shelf wear, surface oxidation, or casting discoloration may be present.

Please review all available photographs carefully to determine exact condition before purchase.

For collectors and restoration enthusiasts seeking authentic GM small-block exhaust components, this 1957–1964 Chevrolet NOS RH Exhaust Manifold #3817806 (Cast 3750556) represents an excellent opportunity to restore factory-correct exhaust performance, originality, and long-term value in your classic Chevrolet restoration project.