1957–1965 Chevrolet Corvette 283 / 327 NOS RH Exhaust Manifold #3817806 (Casting #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 1957–1965 Chevrolet Corvette applications equipped with 283ci and 327ci small-block V8 engines (various specific configurations). This original GM service replacement component is a rare and highly desirable piece for Corvette restorers seeking factory-correct exhaust system components.

The 1957–1965 Corvette era represents one of the most significant periods in Chevrolet performance history. This generation includes the evolution of the C1 Corvette into the early C2 Sting Ray years, along with the introduction and refinement of Chevrolet’s legendary small-block V8 engines. The 283 and 327 engines helped establish Corvette as a true American performance icon, offering increased horsepower, improved reliability, and race-inspired engineering.

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, efficiency, and performance. A properly functioning manifold ensures correct exhaust scavenging, balanced engine operation, and consistent performance—especially important in high-revving Corvette applications.

Over time, original exhaust manifolds can develop cracks, warping, corrosion, or flange damage due to repeated heat cycles and engine stress. These issues can lead to exhaust leaks, reduced performance, increased engine noise, and improper exhaust flow, making replacement essential during restoration.

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 proper 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 Corvette restorers aiming for factory-correct appearance and performance accuracy.

For restorers, maintaining correct exhaust system components is essential for both authenticity and proper engine function. Whether restoring a C1 fuel-injected Corvette or a C2 327-powered Sting Ray, this manifold helps preserve original factory configuration and performance integrity.

As original Corvette small-block exhaust components become increasingly difficult to source, NOS manifolds such as this have become highly sought after by collectors, restoration professionals, and Corvette enthusiasts worldwide.

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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 1957–1965 Chevrolet Corvette applications
• Compatible with 283ci and 327ci small-block V8 engines (various configurations)
• Factory-correct exhaust system component
• Supports proper exhaust flow and engine performance
• Original GM service replacement part
• Never installed on a vehicle
• Rare Corvette-specific exhaust component

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Vehicle Compatibility

Fits select Chevrolet Corvette applications:

• 1957–1962 Chevrolet Corvette (C1) – select 283ci applications
• 1963–1965 Chevrolet Corvette (C2) – select 327ci applications

Compatibility varies depending on engine configuration, exhaust routing, and production 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 Corvette restoration enthusiasts seeking authentic GM exhaust components, this 1957–1965 Chevrolet Corvette NOS RH Exhaust Manifold #3817806 (Casting #3750556) represents an excellent opportunity to restore factory-correct performance, originality, and long-term value in a classic Corvette restoration project.