About two month ago, I was buidling an engine in my auto tech class. The engine was a Ford 289. Well, I had apparently gotten the wrong torque specs for the main caps, because they said 80 FT/LB. So, I set the torque wrench to 80 FT/LB and started tightening the main cap bolt, when SNAP, the bolt broke! So, I checked the sheet again, checked the wrench, lowered the wrench to 70 FT/LB. Went to the next bolt, started tightening it, then SNAP, that bolt broke too! So, this time I went and got a different torque wrench thinking maybe the wrench I had needed to be calibrated. I lowered the new wrench to 60 FT/LB, started tightening the next bolt, when SNAP, that bolt broke too! I was dumbfounded, so I lowered the wrench to 50 FT/LB, then went to the next bolt, and what do you know? SNAP! Finally, I said screw this and set it to 25 FT/LB and the bolt finally didn't break. Luckily, that engine wasn't going to be used in a car (it had two fist sized holes in the block from rods blowing out) so I didn't have to take the time to pull the broken bolts out. I felt like an idiot after breaking off four bolts. The other guys in the class seemed to get a kick out of it. lol. Although it wasn't as bad as the guy next to me who was torquing a plastic valve cover and din't read the specs right. He tried torquing it to 30 FT/LB instead of 30 IN/LB!