4% GSC P-D GM 2.1in L x .341in ID x .5022in OD .35 TAPER Mngns Brnz Intake/Exhaust Valve Guide - SET 8 GSC Power Division Sale! from 7771 8090 /per Qty. Add to Cart This item is either made to order or has limited inventory. Please reach out to confirm lead times if needed. GSC P-D GM 2.1in L x .341in ID x .5022in OD .35 TAPER Mngns Brnz Intake/Exhaust Valve Guide - SET 8