Should be two on either side of the lower engine block and two in the front and rear of the engine. Some are behind components such as the starter, engine mount, and two are between trans and engine. You can usually see a leaky casting plug if you search hard enough. Unless it is at the rear of the engine. This case you will see coolant running from the bell housing. Ensure there is no leak at the rear of the engine such as heater hose or intake manifold running down the back of the engine. It can fool you if you are not careful.
