Engine rebuild

[Retroman1969]

Sounds like classic symptoms of an engine hydro-locking from the cylinders being full of oil. Especially since it started right up and sounded fine after the excess oil had a chance to drain out. In that case I'd also have to agree, AOS most likely. Good thing you shut it down immediately.

[BYprodriver]

Remove all 6 spark plugs & inspect. Try to start engine with plugs out, look to see if oil is still coming out of cylinders. Keep spinning over engine until no oil comes out. Remove oil filter housing & inspect oil filter for metal debris. If nothing in filter change oil, inspect old oil in clean drain pan.

[twelchb]

Thanks to all. Off to a good Porsche mechanic on Monday. Hope it is the AOS.