Description
For Chevrolet Big Block cylinder-head work, this Manley Extreme Duty exhaust valve listing groups the available dimensional choices under one application-specific product family. The parent listing is distinguished by Set of 8, which should be cross-checked against the rest of the engine combination.
The correct Chevrolet Big Block valve is the one that matches the finished head. Stem clearance, seat contact, installed height, spring package, and keeper location should all be checked during assembly.
Key Product Details
- Application: Chevrolet Big Block
- Manley Series: Extreme Duty
- Valve Position: Exhaust
- Title Specification: Set of 8
- Manufacturer Part Number: 12739-8
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.