[Excaliber]

Same cubes does not equal same performance, in my opinion. Some engine designs "build rpm" faster than others. In addition to that other factors will come into play, like internal engine friction and weight of the rotating mass parts. Like pistons, crank, flywheel, etc. Alloy flywheel will "spin up" faster than iron wheel for instance.

Big Bore short stroke will accellerate to max rpm faster than small bore long stroke, cube for cube for instance. It's not surprising the 427 was a big bore short stroke as opposed to the 428 which relied on a longer stroke for more "torque" at a given engine speed. Porsche is famous for it's big bore short stroke approach to engine design.

7 second ricers and Formula One cars are hardly "real world" applications. But DO illustrate the holy grail of racing which is indeed "light weight" in every area.

1 pound shaved off "rotating"weight, like the flywheel or tire/wheels, is worth 3 pounds of static weight, like the drivers belly.