Description
Engine builders working with Chevrolet Big Block can use this Extreme Duty exhaust valve family to choose the required valve dimensions while staying within the correct Manley application group. The parent listing is distinguished by Part #12739-1, 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: Part #12739-1
- Manufacturer Part Number: 12739-1
Package Quantity
Sold individually. One valve is supplied per selected SKU. Order the intake or exhaust quantity required for the cylinder-head configuration being assembled. This quantity applies to the selected Manley SKU family shown on this product page.
Selection & Fitment Notes
Valve fitment should be verified from the cylinder head itself; check the required head size, stem size, overall length, seat work, and valvetrain geometry rather than relying on engine name alone.
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.