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GSC oversize exhaust valve guide for Toyota and BMW B58 engines is specified as +0.001" OD and sold individually to suit precise valve train rework. This guide provides the dimensional oversize required when valve seats or guides need correction or refresh in B58 and compatible Toyota applications. It’s intended for machine-shop replacement work where the listed oversize dimension is necessary.
GSC Toyota/BMW B58 Oversize +.001 OD Exhaust Valve Guide - Single
