Engine noises

[JoeRowing]

It's a 3 bearing, isn't it?

I don't know what noises one should listen for on a 3 bearing.

A three bearing sounds quite different to the two bearing — a quieter engine altogether. I reckon, for this reason alone, it might be worth looking a bit further for that rattle.

Well, the sump will be off too tomorrow...

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Hopefully you're right about the gaskets Charles! Not sure how much has not now been taken to Andy's. 
I have a spare pressure fed 3 bearing bottom end and I might have a 2 bearing one too,  though I think the balanced 2 bearing crank that I was going to keep ended up going with the Marriott.