This is the exhaust valve for 1990-1998 Topkick and Kodiak C6500-C7500 and T6500-T7500 trucks. This is a brand new, factory OEM, genuine GM part, still in the original box. The box is in rough shape. This is for 1 (one) exhaust valve. You will need 7 more for a complete intake valve job. This is for the naturally aspirated 6.0L and 7.0L V8 gas engines.

GM part # 473431

Item is number 35 in the GM diagram.