1999 Cadillac Catera freeze plugs

I went through all the engine mechanical views, as well as cooling system views. There is no mention of block plugs. It looks like from illustration, there are 1-2 in each end of the cylinder heads. I don't see any in the block. I don't recall visually seeing any in the block. My guess if there are, they are at the flywheel end. I have not been under a Catera in some time.