Out Comes the Oil Pan

[i.e.427]

Let's see if we can get this thing to quit leaking all over my floor.


https://www.youtube.com/watch?v=X9cW_UGF2YU

[J R Jones]

Gasket material has a crush charateristic that is "X" inches per inch. 0.10 inch material crushes more that 0.030 material.
This installation has two thick cork composite (0.10?) material layers that crush a lot causing the pan bosses to yield and the load between bosses to unload.
Thin (0.030) paper type gaskets would not crush to this extreme and the pan bosses would not yield.
The nut torque may have been excessive, perhaps as a post installation attempt to stop the leak.

Optimum oil level of a wet sump is a function of the engine geometry, specifically the crank throws which should not spin in the oil reserve. The OEM design is expressed as a dip stick length matched to the dip stick tube length with a specific oil pan volume.
Any dip stick and dip stick tube should replicate the OEM geometry. Determining the level from the bottom up is risky business.
There will be two oil levels, static and running. The static oil level can be the same for a five quart pan as a ten quart pan but only a specific amount of oil will be pumped up into the engine while running with either pan. Therefore the running depth of a ten quart pan will be greater than the running depth a five quart pan.
This editorial suggests one should determine oil depth while running. I do not know how one would do that. Perhaps running excessive oil volume has consequenses.
jim