So I decided to take my motor out and do a once over. Take the oil pan off check rod bearings, take the heads to machine shop but what are oversized head gaskets? I ordered new oem head gaskets but if I do end up getting the heads decked and pressure tested and all I can't use oem head gaskets? Also with the engine apart is there a easy way to tell if the oil pump is bad? What should I look for? And I know it's reccmened to do the full 120k but what can I get away wit not doin? Like do I really need the whole 120k kit or what main parts other than the timing belt can I do?