Eric, look on the passenger side of the block, just below the right head, and there's a sort of a smooth pad there with the numbers stamped into it. They can be a bear to read if the engine is still in the car, and sometimes difficult even if the the engine is sitting on the stand. Use some brake cleaner to get the area clean, then if they're still hard to read, run a piece of fine sandpaper over them LIGHTLY until you can read the numbers.