400 builds-anybody?? NON STROKER!

cuda620, what exare you looking to do? What parts do you already have that you can use? IMO messing with the rod length in a 400 is a mute point unless there is a specific advantage that might be dictated by say a class type application. 400’s run great, they just need some compression and decent heads.

If your gonna buy rods and expensive pistons to mess with the geometry, I would absolutely put a turned down 440 crank and buy the corisponding rotating parts. Those are great motors that also have longevity. Only makes sense from a cost vs what your gonna gain view.