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

...There is ONE more way to remove the Bolt!! I only mention this because 'It' does exist; But Will be Very Hard to Locate a Machine Shop that would even Have this Machine, And that Machine may NOT be Portable enough to work on Your Block while it is Still in the Car. The Machine I refer to is Called a 'Electronic Disintigrator'. Basically one probe clamps to the Block, the Other Probe (Pointed) is placed in Contact with the exposed end of the Broken Bolt. Similar to 'Reversed Electrolosis'; ONLY the Bolt, itself Disintigrates into easily removed 'Pieces' and Leaves the 'Parent' threads in the Block, absolutely UNtouched!! Don't know if this will help You. A Second Idea would be to 'Friction Weld' a Stud onto the Broken Bolt, which could then be Clamped upon, to unscrew the Bolt. This procedure would be the Most Difficult, as You would need a 'Highest Speed' Motor and it would be 'Hand-Held'! One last suggestion! A CARBIDE DrillBit!! Hard enough to drill the Other drills and EZ-out! But still hand-held. Also Very Brittle, Very Expensive. Run it at a Fast Speed, with NO lubricant!! Last: Have You ever seen a 'Magnetic Base' Drill Motor? I wonder if there would be enough room to Mag Mount it to the Front Face of the Cylinder Head, if everything was removed, out of the way?

Marlin