Yes, they are 1/4" holes- - - -originally filled by round-head slotted screws- - - -("stove bolts")! The baffle goes inside the block, a squared-off piece of sheet metal that protects the end of the road draft standpipe from oil splash.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!