Description
This Severe Duty intake valve listing is organized specifically for Chevrolet Big Block, with the available dimensions presented as selectable configurations for easier cylinder-head planning. The parent listing is distinguished by 2.250"; Head / Part #12856-8, which should be cross-checked against the rest of the engine combination.
If the Chevrolet Big Block 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 Big Block
- Manley Series: Severe Duty
- Valve Position: Intake
- Title Specification: 2.250"; Head
- Title Specification: Part #12856-8
- Product Family Detail: Severe Duty application focus
- Manufacturer Part Number: 12856-8
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
Confirm head diameter, overall length, stem diameter, keeper/groove style, seat compatibility, and installed-height requirements with your cylinder-head specification before ordering.
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.