Description
Built around the requirements of Chevrolet Small Block, this Extreme Duty exhaust valve family gives engine builders a focused way to select the dimensions their cylinder-head combination calls for. The parent listing is distinguished by 1.625"; Head / Part #11721-8, which should be cross-checked against the rest of the engine combination.
The correct Chevrolet Small 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 Small Block
- Manley Series: Extreme Duty
- Valve Position: Exhaust
- Title Specification: 1.625"; Head
- Title Specification: Part #11721-8
- Manufacturer Part Number: 11721-8
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.