Ah thanks guys - glad to see that Nissan builds their motors like VW does - sensibly, without changing specs much between differing versions of the same motor.

I stripped the sump off my import motor last night and it's as clean as a whistle inside - no ridge on top of the bores and minimal bearing wear.

I changed the big end bearing shells with some good ol' Aussie ACL ones just to be sure,as the poor thing is sure to have a tough life from now on