Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 90603 found under Push Rod Engine Poppet Valve by Ulstein Bergen A S. The National Stock Number assigned to this part is 2815013033279, and the Federal Supply Class is 2815 Diesel Engines And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 90603.