It was not drilled installed in the truck. We drilled it when it was on a stand. I did have to take the grille, parts and radiator out when I finally got the plate & pump in without it leaking. Frankly it would be just as easy to drill it inside the engine compartment if you remove the radiator & grille. It was really easy as the block metal seemed to be soft and the drill bit cut right into it. Just besure to keep it level and straight and only go in the depth on the instructions. Don't go too deep and it will all work out. Good luck.
