Which way does the rear main seal go?

[6 Nebraska IDIs]

Open lip in (engine side) or open lip out (flywheel side)???
Trying to get this motor sealed up completely and this is the last little bit of info that I don't know and it isn't listed anywhere.

 

[suv7734]

Open lip inside towards crankcase. Easy way to remember- any pressure in the crankcase will 'push' the seal tighter against the crankshaft.

 

[sle2115]

Open lip inside towards crankcase. Easy way to remember- any pressure in the crankcase will 'push' the seal tighter against the crankshaft.

+1