6ZQ is short for the FAA issued N number of the plane: N6ZQ.
Bill Harrelson started the N6ZQ project on May 20, 2004, with the airworthiness certificate being issued September 18, 2012. N6ZQ is a Lancair IV powered by a Barrett IO-550 non-turbo, 10:1 pistons, oversized oil sump, GAMI injectors, and pressurized mags.
Bill built N6ZQ with the intention to challenge World speed records.
He documented the build at