Description
This Manley Severe Duty intake valve family is intended for Chevrolet Big Block 2.300 Head Diameter .5.494"; Stem builds where valve dimensions need to be matched deliberately to the cylinder head, seat work, and valvetrain geometry. The parent listing is distinguished by Set of 8, which should be cross-checked against the rest of the engine combination.
If the Chevrolet Big Block 2.300 Head Diameter .5.494"; Stem 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 2.300 Head Diameter .5.494"; Stem
- Manley Series: Severe Duty
- Valve Position: Intake
- Title Specification: Set of 8
- Product Family Detail: Severe Duty application focus
- Manufacturer Part Number: 12854-8
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
Use the finished cylinder-head setup as the authority for selection. Oversize valves or alternate lengths may require machining and can affect installed height and valvetrain geometry.
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.