Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81890 found under Rocker Arm Engine Poppet Valve by Rolls Royce Marine North America. The National Stock Number assigned to this part is 2815013027631, 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 81890.