Today I pulled the chevy 6 cylinder out of my I/O boat after blowing 3 head gaskets. The motor was getting tired and I had one out of a scrapped boat.I tore the spare down, replaced the seals and installed a new Head gasket. last month I purchased a used SK beam type torque wrench at an auction and it required a lot more effort to torque the head bolts to 95 ft lbs than it had with my Williams click type wrench. When I put the SK on the motor with the blown head gasket the head bolts turned 1/2 to 2/3 before registering the proper torque. Lesson learned, my 2 click type are going in for recalibration. Do you trust yours?