Ok well I had what I thought was broken rings due to loads of oil in inlet. Had a spare bottom end so I thought I would put that in while I was waiting to rebuild my original block. Anyway it started up first time and sounds like a diesel! It's like a knocking sound but not like the vibrating noise that happens when the bearings go. I realize I havn't given you much to go on but any help steering me in the right direction would be appreciated.