The 6081 is the 8.1 litre inline six of the PowerTech family, built on a 116 mm bore and 129 mm stroke (494 cu in). Its real identity sits in the configuration code that follows the number — from the turbocharged T build through the aftercooled A and the 224 kW H version to the 250 hp AF industrial rating — and compression ratio moves with the build between 16.5 and 15.7 to 1. This page lists the configuration codes, the part numbers that belong to each, and the neighbouring