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GSC manganese bronze exhaust valve guide for Subaru/Scion BRZ and Toyota FR‑S with the FA20 engine is offered as a single replacement component by GSC Power Division. Intended for head servicing on FA20 engines, the guide restores exhaust valve stem control and running clearance. Supplied individually to let technicians replace only the worn guides during valve train maintenance or rebuilds.
GSC P-D Subaru/Scion BRZ/FR-S FA20 Manganese Bronze Exhaust Valve Guide - Single
