Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 301-8253 found under Coverengine Poppet Valve Rocker by Unac. The National Stock Number assigned to this part is 2815016928495, 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 301-8253.