They have been known to twist-off.. ... just a hint for preparedness..
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My head bolts looked like that when I removed them. Isn't the torque spec around 90 lb-ft? If so, then it's probably gonna take a lot more than 100 lb-ft to break them loose. Use a breaker bar with some 2" sch 40 pipe on the end.
x2
aircleaner looks nice by the way! just removed my head bolts yesterday. used the "cheater bar" on top the breaker bar method as mentioned above.