Holes in a 345???
started tearing down my 345 yesterday and under the plate under the intake manifold there is a hole. two actually that i don't think are supposed to be. towards the back there's a ridge. in front of it is one that i know is supposed to be there but behind the ridge is another that is about an inch wide and an two inches wide and all jagged. another is on the front wall on the right and is roughly the same size as the other and jagged as well. last time i ran it, it ran fine and i don't see them causing any problem, just increased oil flow but is it a sign that it ate itself at some point? and if you're wondering, yes this is the first engine i've torn apart with the exceptions of a lawn mower and model airplane engines. thanks for any of your help.
'95 Pathfinder SE-V6