Supertech Performance GDE-BMS14-7-OS1-12 Manganese Bronze Valve Guides BMW S14/S38 7mm Stem Oversize

These premium valve guides are essential components for cylinder head rebuilds and performance applications requiring superior heat dissipation and durability.

Key Specifications:

• Material: High-quality manganese bronze
• Valve stem diameter: 7mm
• Outer diameter: 12.065mm (oversize OD)
• Application: Both intake and exhaust positions
• Fitment: BMW M3 and M5 models with S14 and S38 engines

Performance Benefits:

• Precision-machined from manganese bronze for superior wear resistance
• Enhanced heat dissipation compared to standard cast iron guides
• Oversize outer diameter for worn cylinder head bores requiring machining
• Designed to work optimally with low-friction black nitride valves
• Ideal for high-performance, racing, and rebuild applications

Supertech valve guides are manufactured to exacting tolerances and provide the durability needed for high-RPM operation, aggressive cam profiles, and increased valve spring pressures. The manganese bronze material offers excellent thermal conductivity and resistance to galling, making these guides perfect for drag racing, road racing, rally, and other motorsport applications. Professional installation with proper machining equipment is required.