Description
Built around the requirements of Chevrolet 409, this Race Series exhaust valve family gives engine builders a focused way to select the dimensions their cylinder-head combination calls for. The selectable configurations in this family are separated by head diameter, overall length, stem diameter, so the final SKU should be chosen from the dimensional requirements of the build.
If the Chevrolet 409 cylinder head has been ported, fitted with oversized seats, or changed from its original valvetrain layout, confirm the required valve measurements after machining rather than using a stock-size assumption.
Key Product Details
- Application: Chevrolet 409
- Manley Series: Race Series
- Valve Position: Exhaust
- Product Family Detail: Race Series application focus
- Manufacturer Part Numbers: Vary by selected configuration (2 SKUs in this parent family)
Available Configurations
This parent listing contains multiple selectable Manley SKUs. Choose the configuration that matches the measured engine or cylinder-head specification.
- Head Diameter: 1.750in, 1.735in
- Overall Length: 5.105in
- Stem Diameter: 0.3715in
Package Quantity
Set of 8 valves. The selected configuration is supplied as a 8-piece valve package. This quantity applies to the selected Manley SKU family shown on this product page.
Selection & Fitment Notes
Before purchase, compare the selected valve dimensions with your head manufacturer or engine builder’s specification, including stem diameter, valve length, seat diameter, and keeper arrangement.
Professional engine assembly and measurement are recommended. Product specifications should be confirmed against the selected Manley part number and the requirements of the exact engine build.