Upgraded version of Ford Performance M-6049-M52A 5.2L cylinder head Production 2021 GT500 RH cylinder head Improved high-performance 5.2L head castings provide added strength and increased size of central cooling passages, to support higher horsepower engine builds Fully CNC ported intake ports, exhaust ports and combustion chamber Larger port sizing than the 2015-2017 5.0L Coyote cylinder heads 38.3mm intake valve and 32.5mm exhaust valve 2015-2017 5.0L Coyote valve sizes are 37.3mm intake, 31.8mm exhaust New valvetrain geometry allows for higher valve lift Lightweight hollow-stem intake valves and sodium-filled exhaust valves Stiffer exhaust valve springs Upgraded valve guides Upgraded exhaust valve seat Loaded head assembly minus camshafts, rocker arms and lash adjusters To use on 5.0L Coyote requires unique camshaft due to valvetrain geometry, see M-6550-M52 or M-6550-M52A Requires 5.2L rocker arms and lash adjusters, see  M-6564-M52 Requires M-6067-M52B head changing kit Installation of 5.2L heads on 5.0L engine requires piston modification for proper piston to valve clearance  For LH cylinder head see M-6050-M52B