Here's the engine assembly with the clutch fully installed. Hein weighs the engine dry (this one is 444.8 pounds) and then adds oil (20.7 pounds, in this example) to achieve a target weight before the finished assembly is shipped to Bowling Green. (Each engine's weight varies due to the amount of lubricant used in its construction. The amount of oil added is different from engine to engine to account for this variance.) Hein is holding up the engine-manifest sheet, which details every aspect of the build and is kept on file at the PBC for future reference.