PCV valve, cracked head, blown head gasket, broken ring, broken piston, valve guides - who knows - I think before you pull the head you should check the PCV valve and run a compression test to see what shape the rings are in. If the compression looks ok, pull the head and find the problem - you might not need a new head - only valve stem seals/guides.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum