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This GSC exhaust valve guide is a single +.001in oversize OD replacement for Nissan SR20DET and RB26 exhaust ports, supplied with a stopper. The oversize outside diameter option addresses slight bore wear and allows a corrected fit during head service. It’s intended for exhaust-side use where a minor oversize recondition is required without machining beyond this increment.
GSC P-D Nissan SR20DET/RB26 Exhaust Valve Guide w/Stopper +.001in Oversize OD - Single
