"Not trying to be a wise guy o
"Not trying to be a wise guy or anything, but are you sure you are looking at the right plugs?
The block drains are down low, just about exactly midway along each side of the block, about 1 inch above the oilpan-to-block mating line. They are 1/4" NPT plugs, so quite small.
If all else fails, I would drill them through with a 1/8" drill bit, so as to at least drain your block, then have a dealer replace them with a petcock in the spring. Better that than risk a cracked block.
If its a rebuilt repower package it is possible that they were not removed during the rebuild. The block may have been an auto or truck engine, and they may have been in the block a long time.
Rod"