[OnAir]

I have read on several threads that the valve cover Nyloc nuts and washers act as seals.
I cannot understand why but I am a newbie here so I am open to an explanation.

Wouldnt the valve cover gasket also seal around the studs from the motor block, ie no extra sealing on the studs needed?

I am an engineer by trade and if this was my design I would use standard nuts and Nordlock washers which after many years of trials is the only truly reliable locking solution. But no sealing there - then again I cannot understand why it would be needed with a 100% functioning gasket?

I am keeping an open mind so somebody explain where my logic is wrong.