Originally Posted by BeachBum2
They were poured in place (cinder blocks. I drilled a number of holes in them and never hit what would feel like poured concrete, so I'm not sure if they are even poured at all. The place was built in 1964, before all the earthquake codes.
I don't think we're on the same page here,you would be able to tell a poured in place lintel,as opposed to a precast one and you say they are cmu's,at any rate be very careful when you start cutting,and have a planned escape route in mind. Good luck.