Manley 13993TC-8 Pro 900 Series Titanium Valve Locks 8 Degree 5/16 Inch Valve Stem

The Manley 13993TC-8 valve locks are precision-engineered titanium components designed for high-performance racing applications. These 8-degree Pro 900 Series valve locks feature PVD (Physical Vapor Deposition) coating for enhanced durability and easier disassembly in high spring pressure and high RPM environments.

Key Specifications:

• Valve stem size: 5/16 inch (0.3100 inch)
• Groove type: 0.048 inch radius (non-Bead Loc)
• Lock angle: 8 degrees
• Material: Titanium with PVD coating
• Gage diameter: 0.500 inch lash cap recess
• Standard installed height
• Set includes 8 pairs (16 pieces total)

Important Compatibility Notes:

• Must be paired with compatible 0.500 inch gage retainers
• Requires valves with 0.048 inch radius keeper groove specification
• Not compatible with traditional Manley Bead Loc grooves (0.055 inch radius)
• Designed for high spring pressure and high RPM racing applications

The titanium construction combined with PVD coating reduces weight while providing superior wear resistance and simplified maintenance during valve train service. These Pro 900 Series locks are engineered for professional racing environments where reliability and performance are critical.