On the left are two types of torque wrenches used to tighten head bolts. Over tightening, under tightening & un-even tightening can result in many problems. My 8 (8-32) head bolts are tightened to 22 in lb of torque. Clean unplated alloy steel screws are used with no lubricant when tightening the head bolts. The strobe on the left is used in the darkness to detect the movement of parts during dyno pulls. What can be seen is very surprising, especially during wide open throttle runs!
