The once-and-always king of American muscle, the dual-magneto, dual-plug, billet blown fuel Hemi, with 12,000hp How much pauer does it take to do this? Interesting how people don't bother to rev blown cars very high. When the Hemi returns, Ford and Chevy, not to mention the Eurotwits will be bawling in their beer.
Now, to be sure, these guys can have any valve position they like, yet a Pro Stock "Hemi" engine comes with its valves positioned not-quite-directly-apart from each other. As you can tell, high-zoot naturally-aspirated two-valve engines profit from valve position that emphasizes swirl upon the intake charge entering the cylinder, as the intake valve is quite off-axis from the exhaust, and most likely the cylinder bore. You can tell by the photo that neither the exhausts nor intakes are centered on the bore. A reminder the big holes under the valve cover are the spark plug holes, if it helps you orient where the valves are, etc.
