How to tell the difference between a 4.6 and a 5.4 Ford engine

There are a few ways to tell the difference between a 4.6 and a 5.4 Ford engine:

1. Check the engine code: The engine code can be found on a sticker on the valve cover or on the emissions sticker in the engine bay. The engine code for a 4.6 is typically "4.6L" or "4.6L SOHC" (Single Overhead Cam) and the engine code for a 5.4 is typically "5.4L" or "5.4L SOHC" or "5.4L DOHC" (Dual Overhead Cam).
2. Check the engine size: The 4.6 liter engine is physically smaller than the 5.4 liter engine, so if you are able to visually inspect the engine, you can tell the difference by size. The 4.6 liter engine is around 31 inches long, while the 5.4 liter engine is around 34 inches long.
3. Check the engine's specifications: The 4.6 liter engine typically has a bore of 90mm and a stroke of 90mm, while the 5.4 liter engine typically has a bore of 90mm and a stroke of 105mm.
4. Check the VIN number: The VIN number of the vehicle can also indicate the engine type, check the 8th digit of the VIN number it should be a "W" for a 4.6L engine and "Y" for a 5.4