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Drilling the head works as long as the threads aren't locked in place with sealant (e.g. red, blue or green), in which case you'll need to apply enough heat and/or leverage to remove it.
Once upon a time, I was stuck w/o the proper torque aid to remove the flywheel bolts. I used a 1/2" dr. drill motor and large drill bit to remove each bolt head. Luckily, all it took was finger strength to rotate the remaining threaded shaft after the head was excised.
Sherwood
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