I've talked to folks that have had to drill out their Boxster head bolts due to over-torque before. Going 120deg after a bolt is already tight is a helluva lot of torque (I estimate close to 300ft-lbs). My two bits were a Chinese harbor freight special (which twisted the bit so looks like a worm gear) and a Crafstman where the bit shaft shattered.
I guess I'll stop by HD and pick up a 300ft-lb electric impact (and impact bits) to see if that does the trick. If not - return - and pick up a 500+ ft-lb pneumatic. Failing that, drill baby drill!
