the cam 'plugs' , as Justice said and the seam on the cam 'caps' can leak,,front and back. I just fixed my right bank but still have a leak somewhere up front. The oil will flow back along the head gasket lip and then blow down onto the pan at the bellhousing and drip on the crossover. Leaks on this engine are very common. Unless your really loosing alot I'd put up with it. You fix it and it will be leaking somewhere else. Good luck.

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.