Description
This Extreme Duty Pro Flo exhaust valve listing is organized specifically for Chevrolet LS3 / L - 99 (L - 92 Head), with the available dimensions presented as selectable configurations for easier cylinder-head planning. The parent listing is distinguished by 1.600"; Head, which should be cross-checked against the rest of the engine combination.
For Chevrolet LS3 / L - 99 (L - 92 Head), 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 LS3 / L - 99 (L - 92 Head)
- Manley Series: Extreme Duty Pro Flo
- Valve Position: Exhaust
- Title Specification: 1.600"; Head
- Manufacturer Part Number: 12357-8
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.