I have been looking for the size of valves that my engine has and I want to upgrade the injectors, I know where they are on the 4.6 but not the 3.8 if anyone knows the info would be apreciated

 

IM not sure why your trying to replace your injectors as stock injectors are more then enough for your n/a 3.8L. But on your motor on the top there is a silver fuel rail on each side and there connected to the bottom of the fuel rail. If you know what they are you should easily be able to see them.