The S65 block (crank/case/bedplate) is more than capable of withstanding at least 800hp on its own. The OE rods would fold under the pressure though. A set of H beam rods, with the proper bearings and pistons, and it will take whatever you feed it all day. It is EASILY one of the most insanely engineered bottom ends on the planet. Minimal jacketing in the case, No main caps, but a solid girdled/sealed bedplate, and (3x) torque to yield steel bolts. It could hold a nuke if it needed to. The 414hp that it handles on the daily is nothing... that figure is like God pushing a radio-flyer! No effort
