Production 2018 RH (right hand) Mustang GT 5.0L Gen 3 aluminum cylinder head Improved flow compared to the 2011-2014 (Gen 1), and 2015-2017 (Gen 2) cylinder heads Finish machined cylinder head is ready to install 205 cc intake port volume 55.0 cc chamber volume 32 mm exhaust valve 37.7 mm intake valve Includes intake and exhaust valves, valve springs, and retainers Does not include camshafts, rocker arms, or lash adjusters Note-will not fit 2011-2017 5.0L Coyote engines