Supertech ST-GDE-HB55-E-OS1-8 – Exhaust Valve Guide Set (Honda B-Series, 5.5 mm)

Supertech’s ST-GDE-HB55-E-OS1-8 kit supplies eight manganese-bronze valve guides for the exhaust side of Honda B-series heads (B16A/B17A/B18C/B18C5) that use 5.5 mm valve stems. CNC-machined to tight tolerances, they improve heat transfer, reduce stem friction, and outlast the factory sintered guides.

Key Features

• Manganese-bronze alloy offers superior wear resistance and thermal conductivity compared with OEM material—critical for high-rpm or boosted engines.

• Precision CNC finish ensures perfect concentricity and stem support, maintaining valve sealing at extreme engine speeds.

• Oversize +0.001″ outer diameter (12.09 mm) allows proper interference fit in serviced cylinder heads.

• Direct fit for 5.5 mm exhaust valves, including Supertech black-nitride valves and most aftermarket options.

• Complete set of 8—replaces every exhaust guide in a four-cylinder B-series head.

Technical Specifications