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Got any tips on removing such bolts? Any special drill bit? Grade 8 steel is not a steel I would take my 'steel' bit too. I realize the quality of this metal. What would you recommend anyone?
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While you absolutely can get them out with HSS bits, you need to have a very specific feed and turn rate or you'll just dull them in 60 seconds. If your just doing this with a hand drill, center punch it, start small, and as the bit size increases decrease the drill speed. Drill it out as far as you can prior to trying the easy out, and warming up the block won't hurt.
Tungsten carbide bits if you can find a set. You might consider trying to borrow a set, as they'll be expensive. Just be prepared to shell out of you break one. I've got more than a few 30$+ bits.
Paul