Used correctly, a dial bore gauge is one of the best instruments ... calipers and a set of telescoping gauges. The gauges find the maximum inside diameter of an object and lock in place.

Measuring the inside diameter of a main or rod bearing will require a dial bore gauge. The best ones are accurate down to 0.0001-inch and generally come as a set that offers a measurement range ...

If you set the dial-bore gauge to the crank-journal diameter, the difference between the inside diameter of the bearing and the crank journal will be the oil clearance. PlastigageThe reason many ...