leak down h: or an impact gun on the puley to get it to spin fast enough to give an idea of compression by spinning the motor. This is super ghetto, and if you have an impact you have air and if you have air you should just do a leak down. Besides compression tests are they gay. They don't really give you the health of the motor like a leak down. Shit I could pour half a cap of oil in each cylinder before you show up even if its in a running car and be like oh wow look 130 across the board...leak down FTW.