Description
This Manley Severe Duty exhaust valve family is intended for Chevrolet Big Block builds where valve dimensions need to be matched deliberately to the cylinder head, seat work, and valvetrain geometry. 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.
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: Severe Duty
- Valve Position: Exhaust
- Product Family Detail: Severe Duty application focus
- Manufacturer Part Numbers: Vary by selected configuration (29 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: 1.900in, 1.880in, 1.940in, 1.850in, 1.725in, 1.600in, 1.625in, 1.720in
- Overall Length: 14 selectable values (including 5.422in, 5.522in, 5.500in, 5.374in, 5.221in, 5.454in)
- Stem Diameter: 0.3110in, 0.3415in, 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
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.