Description
Built around the requirements of Chevrolet L83 5.3L, this Extreme Duty Pro Flo 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 1.560"; Head, which should be cross-checked against the rest of the engine combination.
If the Chevrolet L83 5.3L cylinder head has been ported, fitted with oversized seats, or changed from its original valvetrain layout, confirm the required valve measurements after machining rather than using a stock-size assumption.
Key Product Details
- Application: Chevrolet L83 5.3L
- Manley Series: Extreme Duty Pro Flo
- Valve Position: Exhaust
- Title Specification: 1.560"; Head
- Manufacturer Part Number: 12363-8
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
Before purchase, compare the selected valve dimensions with your head manufacturer or engine builder’s specification, including stem diameter, valve length, seat diameter, and keeper arrangement.
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.