The GSC Power Division intake and exhaust valve guide set for GM applications is supplied as a set of eight manganese-bronze guides sized 2.1 inch length, 0.341 inch inner diameter and 0.5022 inch outer diameter with a 0.35 taper. This indexed set matches the dimensions shown in the source listing and is intended for valve guide service or replacement on compatible GM engines.
GSC P-D GM 2.1in L x .341in ID x .5022in OD .35 TAPER Mngns Brnz Intake/Exhaust Valve Guide - SET 8