Cosworth YBB - Assembled by Cosworth Engineers from all new parts. Never installed in any car. Only run time was on Cosworth dyno for break in and then 5 dyno pulls, all performed by Cosworth technicians. Engine being sold as Long Block with these extras included. A down exhaust system through collector, never run. A slide injector system, and a flywheel with Tilton dual-disc clutch system never used.