block casting number? 010 blocks are what you list..... block casting is the casting number while the suffix code tells what the block was machined to be and what the engine config was. I think 010 blocks were the most common casting from 69 up thru
79 or 80....at least in my experience. Just because the block was an 010 casting doesn't make it a Z/28 block... the DZ suffix does. These are the books I use:IMG_5360.jpg