The GSC intake valve guide for BMW 335i E92 L6 engines is a manganese bronze replacement supplied as a single unit with a +.003in oversize outer diameter. It provides direct-fit valve guidance to maintain valve stem alignment and smooth operation in rebuilt heads. The larger oversize option helps achieve proper interference and seating when guide bores have been machined to accept a bigger guide.
GSC P-D BMW 335i E92 L6 Manganese Bronze Intake Valve Guide +.003in OD - Single