Mechanics use a machine if the ac pressure is not there. I can not think of what the machine is called at the moment. IT basically sucks air out, so when the Freon is put in excess air does not occupy the space. I am not great at explaining this vs understanding how to do it.
new engine,1.7 rocker arms,Pipes exhaust, shorty cats , shorty headers,under drive and overdrive pulleys,4.2 upper plenum, throttle body spacer, cold air intake, stage one clutch, shorty shifter, and tune. 8.8 in storage