Product Description
Genuine Stant CO-66 Oil Filler Cap (NOS)
NEW Out of box, this will not come with original Stant box.
Maintain the sealed integrity of your vintage engine's crankcase with this genuine Stant CO-66 Oil Filler Cap. This is a vintage New Old Stock (NOS) part, preserved in its original packaging. As a "Closed" type cap, it is specifically designed for vehicles equipped with closed positive crankcase ventilation (PCV) systems, ensuring proper emission control and preventing oil leaks.
This part is designed for the valve cover oil fill hole on specific 1949-1967 Chevrolet, Buick, Oldsmobile, Pontiac, and AMC vehicles, particularly 6-cylinder and small V8 models requiring a 1-3/8" I.D. cam-lock cap. It acts as a direct replacement for the standard breather cap in closed system applications.
Key Features:
- Part Number: CO-66 (Stant)
- Interchange Part: Stant SO-66, 10066 (Standard/Painted Version Equivalent)
- Type: Closed System (Non-Vented)
- Fitment Size: Fits 1-3/8" I.D. Cammed Hole
- Finish: Chrome / Zinc Plated
- Origin: Made in USA (Vintage Stock)
- Condition: New Old Stock (NOS)
Verified Vehicle Fitment:
| Make | Model | Year | Notes |
| AMC | American | 1967 | Closed System |
| Buick | Special, Skylark | 1964-1967 | Calif. Closed System |
| Chevrolet | Passenger Cars | 1949-1954 | All Models |
| Chevrolet | Passenger (6 Cyl) | 1955-1967 | W/ Vented Valve Cover |
| Chevrolet | Chevelle | 1966 | 396 Engine |
| Chevrolet | Corvair | 1960-1969 | Check Application |
| Chevy/GMC | Trucks (6 Cyl) | 1955-1963 | Specific Models |
| Oldsmobile | F-85, Cutlass | 1964-1967 | Calif. Closed System |
| Pontiac | Tempest, LeMans | 1964-1967 | Calif. Closed System |
| Rambler | 199, 232 Eng. | 1964-1967 | Calif. Closed System |
Fits Years:
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967
Unbeatable Prices & Expectations
We scour the country to find the best deals on NOS and NORS parts so we can pass the savings on to you. Our prices are often significantly lower than major competitors.
Please Note: All vehicle fitment data is manually researched from vintage catalogs. While we strive for accuracy, historical data can sometimes be imperfect. We strongly encourage you to perform your own due diligence by comparing our provided photos and specifications to your original part to ensure proper fitment before purchasing.
