Applicable Engine: compatible with Ford 3.5L upgraded EcoBoost engine. Application Vehicle: compatible with Ford GT equipped with 3.5L EcoBoost upgraded engine (2017-2019); Expedition equipped with 3.5L EcoBoost upgraded engine (2018-2019); F-150 equipped with 3.5L EcoBoost upgraded engine (2017-2020); compatible with Lincoln Navigator equipped with 3.5L EcoBoost upgraded engine (2018-2019). Note: This tool (303-1655) opening size is 26mm, only compatible with Ford 3.5L upgraded EcoBoost engine, not fit old version 3.5L EcoBoost engine. Because the old version 3.5L EcoBoost engine camshaft hold tool is 303-1248, the openning size is 22mm. please carefully check your car engine model before order. Package Include: 2x Camshaft holding tool. 1xCylinder head screw removal socket. Application: This camshaft alignment tool compatible with Ford 3.5L V6 upgraded EcoBoost engine, not fit 3.5L 4V engine. compatible with Ford GT (2017-2019); Expedition equipped with 3.5L V6 EcoBoost upgraded engine (2018-2019); F-150 equipped with 3.5L V6 EcoBoost upgraded engine (2017-2019); compatible with Lincoln Navigator equipped with 3.5L V6 EcoBoost upgraded engine (2018-2019) With RT11 Cylinder Head Screw Removal Socket: This kit include RT11 cylinder head screw removal socket, the socket head is wide-sided hexagonal plum, with 1/2-Inch drive, use for remove cylinder head screw, this socket compatible with Ford 3.5L 3.7L engine Camshaft Aligning Tool: 303-1655 only cam alignment tool, can't use for holding camshaft when remove phasers, otherwise, 303-1655 will be bent Easy Aligning Camshaft: We have extend the camshaft hold plate ends, make the end enough long, which easy sit across the head to hold the cam still, OEM Equivalent Part Number: 303-1655 Tips: 3.5L EcoBoost engine have two model, 3.5L 4V is old style, 3.5L V6 is upgraded. this tool only fit 3.5L V6 EcoBoost upgraded engine, not fit fit 3.5L 4V engine. if your car is 3.5L 4V engine, you need choose 303-1248 303-1053