The reassembly was done in the Lexus Service Manager's office to make sure the environment was clean and at "room temperature". The dealer Senior Master Technician did all the work by himself. It took a long time but was done right. He had a side business where he was designing and building his own motor from scratch. A three cylinder for an extreme high milage three wheeled vehicle. AND, no valley plate leak as it was removed and reinstalled for this work with better sealant than the factory.