One tool every gearhead should have and why

A good tap and die set to go with the above torque wrench...

Get a good English SAE tap and die set that goes up to 1/2" and chase every thread on the engine and nuts and bolts before you assemble them... It will clean the threads and provide more accurate torque, not to mention that the parts will go together much easier without the threads binding... You may be able to run most of them down by hand before tightening.... (I know - right???)

I like Irwin/Hanson....

I will NEVER USE CRAFTSMAN TAPS AND DIES AGAIN....