Valve lapping questions

Can i give a tip? pour the alcohol into the port, you'll get more "gravity" pressure to challenge the sealing of the valve/seat due to more volume of alcohol overall and it will all be resting on the seat.

Alcohol will find a leak easier also, due to it's viscosity compared to mineral spirits. (not like it matters that much in this case)
One thing for sure is those valves will transfer the heat off.:D