Its a Ported D16Y6 Head with Shimmed Springs. A D16Y7 Block with all new bearings and polished crank. Comes with D16Y6 Tranny, Skunk2 Intake Manifold, Skunk2 Cam Gear, And DC 4-1 Header...The engine was rebuilt and has never been broken in. No oil ever touched it...Zero Miles on it. It has a 5mm Greedy Head gasket you might not want to use it unless your going turbo.