Description
Built around the requirements of Chevrolet LS1 Small Block 2.055, this Severe Duty Pro Flo exhaust valve family gives engine builders a focused way to select the dimensions their cylinder-head combination calls for. Use the exact Manley part number shown below to distinguish this product from similar valves offered for the same or related engine family.
The correct Chevrolet LS1 Small Block 2.055 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 LS1 Small Block 2.055
- Manley Series: Severe Duty Pro Flo
- Valve Position: Exhaust
- Product Family Detail: Severe Duty application focus
- Manufacturer Part Number: 11680-8
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
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.