The Genuine ACDelco GM 25040733 PCV Valve (CV859C) is an OEM replacement Positive Crankcase Ventilation (PCV) valve designed to regulate crankcase pressure and improve engine performance. Manufactured to General Motors' original specifications, this valve helps remove harmful blow-by gases from the crankcase, reducing sludge buildup while promoting cleaner engine operation and efficient emissions control. This genuine GM part is a direct replacement for compatible vehicles originally equipped with part number 25040733.
Built with OEM-quality materials, the CV859C provides precise airflow regulation for proper crankcase ventilation. It helps maintain optimal engine vacuum, supports smooth idle, and contributes to improved fuel efficiency while protecting engine seals and gaskets from excessive crankcase pressure.
This NOS (New Old Stock) ACDelco PCV valve is ideal for maintenance, restoration, or replacing a worn or malfunctioning valve. Its direct-fit design ensures easy installation and dependable long-term performance in compatible GM applications.
Key Features
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Direct Replacement: Installs easily with OEM fit and function.
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NOS Condition: New Old Stock genuine GM replacement component.
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Improves Engine Performance: Supports smooth idle and efficient combustion.
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Efficient Crankcase Ventilation: Removes blow-by gases to help keep the engine clean.
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Optimized Airflow Control: Maintains proper crankcase pressure and engine vacuum.
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Durable OEM Construction: Built for long-lasting reliability and consistent operation.
- Genuine GM & ACDelco OEM Part: Manufactured to original factory specifications.
Specifications
- Part Number: 25040733
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ACDelco Number: CV859C
- Brand: ACDelco / General Motors
- Condition: NOS (New Old Stock)
- Fitment Type: Direct OEM Replacement
- Type: Positive Crankcase Ventilation (PCV) Valve
- Application: Engine Crankcase Ventilation System