Hi Guys......Has anyone checked the calibration of your torque wrench lately? How did you do it? I recently found that my 'snap' type wrench was not up to the dialed foot pounds on the handle. I was leaving the engine without enough torque on the head bolts. I'm pretty lucky I didn't blow another head gasket before I found out.......I ended up buying a new wrench---but then, is it calibrated correctly?? How do we know?