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
| Parameter | Value |
|---|---|
| Engine family | Honda B16A, B17A, B18C, B18C5 (exhaust) |
| Valve-stem diameter | 5.5 mm |
| Outside diameter | 12.09 mm (+OS1) |
| Length | 44.8 mm |
| Material | Manganese bronze |
| Pieces per kit | 8 |
Vehicle Compatibility
| Brand | Model | Generation / Chassis | Engine |
|---|---|---|---|
| Honda | B15A | - | B16A, B17A, B18C, B18C5, B15A |
| Honda | B16A | - | B16A, B17A, B18C, B18C5, B15A |
| Honda | B17A | - | B16A, B17A, B18C, B18C5, B15A |
| Honda | B18C | - | B16A, B17A, B18C, B18C5, B15A |
| Honda | B18C5 | - | B16A, B17A, B18C, B18C5, B15A |
SUPERTECH
Supertech Honda B18C5/B18C1/B17A/B16A/B15A 12.09mm OD Exhaust Valve Guide - Set of 8
| Brand | Model | Generation | Engine |
|---|---|---|---|
| Honda | B15A | - | B16A, B17A, B18C, B18C5, B15A |
| Honda | B16A | - | B16A, B17A, B18C, B18C5, B15A |
| Honda | B17A | - | B16A, B17A, B18C, B18C5, B15A |
| Honda | B18C | - | B16A, B17A, B18C, B18C5, B15A |
| Honda | B18C5 | - | B16A, B17A, B18C, B18C5, B15A |

