Front crankshaft seal

[9T1 Red ZR1]

Hello,
I have a problem with an oil leak on the front of my 1991. I have oil leaking and I thought it was the front seal. I took the belt off, sprayed everything down to clean the oil and started the engine for 1 minute with the belt off. I don't see oil dripping between the torsional damper pulley and the engine like I was expecting. I do have oil leaking from the bolt holding the pulley, and it is coating the inside of the pulley. Is the crankshaft drilled all the way through to the bolt? Is there a seal for the bolt? don't have any oil from the oil switches or oil cooler hoses, it is all on the inside surface of the pulley.

Thanks for your help.
Bill