How many freeze plugs are on a Chevy small block 400?

depends if you have a scat block or not

NEW ANSWER: There is 2 in the back of the engine block. There is 1 on each side of the timing cover on the front of the engine. There is 2 on each side of the engine block just below the heads. Sometimes there are 3 on the sides of the engine block. Depends on the year.