There's no single definitive answer to how many bolts are on a 1992 Ford 4.9L (300 cubic inch) water pump. The number can vary slightly depending on the specific water pump manufacturer and even minor variations within the same year model.
However, it's almost certainly between 3 and 8 bolts. Most water pumps for that engine use somewhere in that range. You'll need to visually inspect your engine to determine the exact number.
