The 426 Hemi was a compromise from day one, it is not a true Hemi design with the valves centered over the cylinders. Look at the intake valve location, the cylinder wall schrouds it. Now for my on those that have had them and those that want them, be careful of what you wish for, Hemiroids are not for everyone I've had them, sold them, still build them but I race a wedge I'm probally one of the only Mopar racers that can't make as much power with a hemi than I can with a wedge