The entire engine has been beefed up for 2020, the crankshaft rod journals are larger, the cyl heads have extra bolts, the connecting rods are stronger, piston pins larger, lifters are lighter, push rods improved, cylinder block has ribs for strength and improved metallurgy. The deck height of the block is taller. Pistons have been made stronger and are taller. It is not the same engine for the most part. Nothing is that simple anymore when your advertising a 35,000 lb. plus pull load !!! ?