hi all I'm rebuilding my sr20det which suffered bottom end failure the crank has slight scoring so I thought id regrind it but I have been told by someone they cant be reground is this true or have anyone done it and how did it go
Yep they can be reground, but if it's totally knackered it might not be a good idea. A machine shop will tell you if it can be done, and advise (or supply) a set of larger bearings to match.