I have a home that was built in 1920 has all brick finish on the outside with a 1 inch air space behind it.then theirs 8 inch 3 core block .the whole house is this way all 4 sides can I drill holes an have foam put into the block?the interior of the house is finished with plaster an lath right against the block wall.is the foam runny enough to precisely go all way down the block to insulate each core?

The only foam insulation I have seen has a hose go down wall through hole at top of wall. Then hose is pulled up as fam is put in.

Don't think foam will go from top block to bottom block. Holes in block do not line up.

Chuck