Keep your engine's crankcase breathing freely with the Mr. Gasket Engine Crankcase Breather Cap 9810. It fits a wide run of 1960s GM full-size and performance cars, including the 1964-1967 Buick Electra, 1965-1967 Cadillac DeVille, 1966-1967 Chevrolet Corvette, and 1965 Pontiac Grand Prix — see the "Vehicles it fits" section for the full list of 24 applications.
A breather cap manages crankcase ventilation: it lets the pressure and blow-by gases that collect in the crankcase move through the intended path while helping limit oil-mist escape from the valve cover or filler opening.
- Crankcase ventilation: routes crankcase vapors through the designed opening as the engine runs.
- Oil-mist control: helps keep oil mist contained within the ventilation path.
- Simple service part: a straightforward replacement for a cracked, clogged, or missing original cap.
Signs the cap may need replacing include a cap that is broken, deteriorated, or lost, or oil misting around the filler opening. If a worn or missing breather cap is the cause, this Mr. Gasket unit replaces it.
Interchange: Manufacturer part number 9810.
Frequently Asked Questions
What does this breather cap do?
It manages crankcase ventilation, routing crankcase pressure and blow-by gases through the intended path while helping limit oil-mist escape from the filler or valve-cover opening.
Will it fit my car?
It is cataloged for 24 GM applications, including the 1964-1967 Buick Electra, 1965-1967 Cadillac DeVille, and 1966-1967 Chevrolet Corvette. Check the "Vehicles it fits" section for your exact year, make, and model.
Does a breather cap stop blow-by?
No. Blow-by comes from the engine's rings; this cap only manages how those crankcase gases are vented and helps contain oil mist. It cannot prevent blow-by itself.
When should I replace the breather cap?
Consider replacing it if the original is cracked, clogged, deteriorated, or missing, or if you notice oil misting around the filler opening.
What is the manufacturer part number?
This is Mr. Gasket manufacturer part number 9810, an engine crankcase breather cap.
