Supertech Performance GDE-MI66-STE Manganese Bronze Exhaust Valve Guide 6.6mm Stem Standard OD

The Supertech Performance GDE-MI66-STE is a precision-machined exhaust valve guide crafted from high-quality Manganese Bronze — a material chosen for its excellent wear resistance, self-lubricating properties, and ability to maintain tight tolerances under sustained heat and high-RPM conditions.

This guide features a 6.6mm valve stem bore and a 12.07mm standard outer diameter (OD), making it a direct-fit replacement for stock or worn exhaust valve guides. It is compatible with Supertech valve seals VS-M6.6-E and VS-H6.6-E.

Key Features:

• Material: Manganese Bronze for superior wear resistance and thermal stability
• Valve Stem Size: 6.6mm bore diameter
• Outer Diameter: 12.07mm (Standard OD)
• Type: Exhaust valve guide
• Compatible Valve Seals: VS-M6.6-E / VS-H6.6-E
• Precision-machined to exacting tolerances for consistent valve-to-guide clearance
• Designed for use with Supertech's low-friction black nitrided performance valves
• Sold individually — order the quantity equal to your engine's exhaust valve count

Supertech valve guides are engineered to meet the demands of high-performance and motorsport applications. When paired with Supertech's black nitrided valves, these guides deliver an optimized solution for both performance and long-term durability in built engines.