400 engine

no prine, its in the fact that the 400 has a stronger block, has a bigger bore that a 440 a shorter stroke, is smaller physically and we all know a lighter internal assembly with same cubic inches as the 440 will out run the 440 every time. pistons alone you save over 7 lbs then cutting counterweights down ,cutting mains down to b block size is another 15 lbs or more if you do it right and use around a 2330 bobweight, shorter stroke shorter piston, shorter piston, less weight