You may think that your standard valve stems are good enough for your wheels... that is until you see a Monster Valve in action.
We installed a set into a pair of Walker Evans beadlock wheels, and instead of drilling out the preexisting valve stem hole, we left the standard valve stem and drilled a new hole for the Monster Valve. Why? Well, the Monster Valves have a much larger body that standard inflation chucks and pressure gauges will not fit. Leaving the standard valve stem allows you to still fill up your tires at a gas station if you don't have your Monster Valve inflation chuck with you.
How fast do these work? We were able to deflate a 42-inch tire from 22 psi to 10 psi in 13 seconds. We were also able to fill a 42-inch tire from 0 psi to 22 psi in 22 seconds with a standard air source and the Monster Valve inflator chuck. That's 1 pound per second!