Reply to "Snapped bolt in block - how deep can this be drilled?"

Thanks for some good ideas. Looks like my first step will be to try and get a good flat surface on the bolt, or what is left of it. Looks like there are at least 5 different drill indentions in this hole, someone should have given up sooner, would have made my job a bit easier. Once I get the flat surface I will TAP a center punch to help keep the drill bit centered. Don't want to flare out or expand the metal any more than I have to. Will work up from a small bit as far as I can (Left handed bits when I snag them). I might also freeze the area after soaking with WD-40 or the like. I don't believe heating this area will help, like mentioned earlier, it will expand the metal making things tighter, heating could work on a bolt/nut, shaft/bearing,etc. where the surrounding metal had somewhere to expand to other than the object it is jammed on.

Thanks for the depth information, gives me a place to mark for a stop. I can get a straight shot in to this location since it is in the front of the engine and everything will be out of the way. Just another project to fix while waiting for A/C parts and hoses. sigh.

Thanks everyone

Angelo