Leakdown test on rebuilt engine

4spdragtop said
OK, thanks all, so more stupidity on my part(that tanks always full ffs)....I drilled a 3/32 hole. Too big to be able to differentiate between the 2 gauges. Hardware store tomorrow for a 3/64 bit.
Thanks again for the reassurance being a new build. @Bennoel 10 was generous enough to loan me his 4spd bellhousing, so I wanna be as sure as I can I'm good before I pull it from run stand as I wanna give Noel his bellhousing back.
Thanks!

Steve the so called standard is .040" There's more to it than that, if you find the original aircraft spec, it involves orifice entrance and exit angles and such, but close enough for us rednecks. My 1.99 thrift store TI scientific calc (solar LOL) says 3/64 is .0467. If you can get a no. 60 "number drill" that is right on .040