Description
This Manley Severe Duty exhaust valve family is intended for Chevrolet Small Block builds where valve dimensions need to be matched deliberately to the cylinder head, seat work, and valvetrain geometry. The parent listing is distinguished by 1.625"; Head / Part #11577-8, which should be cross-checked against the rest of the engine combination.
For Chevrolet Small Block, valve diameter changes can alter seat work and chamber/shrouding relationships, while alternate overall lengths can change installed height and rocker geometry.
Key Product Details
- Application: Chevrolet Small Block
- Manley Series: Severe Duty
- Valve Position: Exhaust
- Title Specification: 1.625"; Head
- Title Specification: Part #11577-8
- Product Family Detail: Severe Duty application focus
- Manufacturer Part Number: 11577-8
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.