I use a special tool that I made out of a flat blade screwdriver. (they used to call them "Carburetor screwdrivers"...long shank, and the blade is only about 1/4" wide )

I took a cheap narrow bladed screwdriver and bent over just the tip (about 1/8" ) 90 degrees and sharpened it w/ my Dremel. I can go in from the front bearing opening, and catch on the inner edge of the inner race, and tap the bearing out w/ light hammer blows. Moving the tool around each blow so as not to get the bearing cockeyed in the bore as it is driven out.

Set the case on a block of wood with the backplate opening down...front bearing opening pointing up. Heat the case on the block of wood...then use the tool and a small hammer...works every time for me...never had a bearing that didn't come out...never damaged a case either.

It always makes me nervous to think of slamming down a hot Alum. engine case...I think my method is MUCH gentler on the case.