Quote Originally Posted by wbute View Post
N is the GMP&A replacement engine pre-fix. It doesn’t stand for anything.
Which is derived from NASCO and that is where the "N" comes from. Holden changed it's parts division name from National Automotive Service Company to General Motors Parts & Accessories around 1972 (Mid HQ). Holden continued to use the "N" from NASCO as a prefix on Genuine Replacement Engines, Chassis and Bodies even when known as GM P&A.