76 ironhead sportster valve leak down test

this is how I test the valves on my ironhead heads. turn heads upside down, make sure plug is installed, fill with weasel piss, put a pc of clean news paper underneath, leave overnight, check in am to see if weasel piss has leaked out, if so you need to seat your valves, if still full your valves are seated properly. probably easier if you split head and cylinder, or not. if it has leaked down you can look into the exhaust and intake ports to see if liquid is present showing which valves are bad