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The Supertech valve guide for Honda B18A, B18B, and H23 engines is specified for exhaust-side service with a 6.6mm valve stem. Intended to restore correct valve stem clearance and alignment, this guide supports accurate valve seating and consistent movement during head repairs or rebuilds. Supplied as a single guide, it targets exhaust-side restoration where the 6.6mm stem size is required.
Supertech Honda B18A/B18B/H23 Exhaust Valve Guide 6.6mm Stem
