Exhaust Valve 4.8L 2001 GMC Yukon - EV3165.428 Exhaust Valve . Fits: 97-15 Chevrolet, GMC, Isuzu 4.8L-6.0L V8 OHV Naturally AspiratedFitment Notes: Nitride Coated, 1 Groove, 39.4mm Head Dia., 7.97mm Stem Dia., 124.8mm O.A.L., Exhaust, LY2, Nitride...