1960–1969 Chevrolet Corvair, Corsa, Monza, Spyder & FC NOS Rear Engine Housing Crankcase Seal #6257476

Available for sale is a genuine General Motors New Old Stock (NOS) Rear Engine Housing Crankcase Seal, GM part number 6257476, designed for 1960–1969 Chevrolet Corvair applications, including Corvair 500, Monza, Spyder, Corsa, and Forward Control (FC) models. This original GM service replacement component is an essential engine sealing part for maintaining proper operation and preserving the integrity of the Corvair’s unique air-cooled powertrain.

The Chevrolet Corvair remains one of the most distinctive vehicles ever produced by General Motors. Featuring a rear-mounted, air-cooled horizontally opposed engine, the Corvair introduced innovative engineering that set it apart from virtually every other American automobile of its era. Throughout its production run from 1960 through 1969, the Corvair evolved into several popular models, including the Monza, Spyder turbocharged variants, Corsa performance models, and FC vans and pickups.

The rear engine housing crankcase seal plays a critical role in maintaining proper sealing between engine components. It helps prevent oil leakage, protects internal engine areas from contamination, and contributes to proper airflow management within the Corvair’s air-cooled engine system. A properly functioning seal is essential for maintaining engine cleanliness, reliability, and overall performance.

Over time, original seals can become brittle, cracked, flattened, or deteriorated due to heat cycles, age, oil exposure, and environmental conditions. A damaged seal can lead to oil leaks, reduced sealing effectiveness, contamination, and potential engine performance issues. Replacing worn seals is an important part of any quality engine restoration or maintenance project.

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. It retains original factory specifications, materials, and dimensions intended by Chevrolet engineers for precise fitment and dependable performance.

Unlike many modern reproduction seals, NOS GM components provide authentic materials, factory-correct dimensions, and original manufacturing quality. These characteristics are especially important for Corvair enthusiasts seeking accurate restorations and reliable long-term operation.

For restorers, maintaining proper engine sealing components is essential to preserving both functionality and authenticity. Whether restoring a Corvair coupe, convertible, turbocharged Spyder, Corsa performance model, Greenbrier van, Rampside pickup, or Loadside truck, using genuine GM parts helps ensure factory-correct results.

As original Corvair engine components become increasingly difficult to locate, NOS service parts such as this rear engine housing crankcase seal have become highly sought after by collectors, Corvair specialists, and restoration professionals.

---

Product Features

• Genuine General Motors New Old Stock (NOS) part
• GM Part Number: 6257476
• Rear Engine Housing Crankcase Seal
• Designed for Chevrolet Corvair air-cooled engines
• Helps prevent oil leakage and contamination
• Supports proper engine sealing and airflow management
• Factory-correct fit and construction
• Original GM service replacement component
• Never installed on a vehicle
• Ideal for restoration, rebuild, and maintenance projects
• Rare Corvair engine sealing component

---

Vehicle Compatibility

Fits select:

• 1960 Chevrolet Corvair 500
• 1960–1969 Chevrolet Corvair Monza
• 1962–1964 Chevrolet Corvair Spyder
• 1965–1966 Chevrolet Corvair Corsa
• 1961–1965 Chevrolet Corvair FC (Forward Control) Models
  • Greenbrier
  • Rampside
  • Loadside
  • Corvan

Compatibility may vary depending on engine configuration and production specifications. Buyers should verify fitment before purchase.

---

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, packaging aging, or light cosmetic imperfections may be present.

Please review all available photographs carefully to determine the exact condition of the item being offered.

For collectors and restoration enthusiasts seeking authentic Corvair engine components, this 1960–1969 Corvair, Corsa, Monza, Spyder & FC NOS Rear Engine Housing Crankcase Seal #6257476 represents an excellent opportunity to restore proper sealing performance, preserve originality, and maintain the long-term reliability of Chevrolet’s iconic air-cooled engine platform.