Crankshaft Positioning Tool: Works with Ford 1993-newer 4.2L V6, 4.6L 2-valve, 4.6L 4-valve V8, 5.4L V8, and 6.8L V10 engines. Replaces part numbers: 303-448, T93P-6303-A, 6024 & 525219. These engines are not freewheel engines; avoid rotating the crankshaft or camshaft when removing the timing chain or installing the cylinder head.