Yeah, it looks like the Hemi's two carbs, better intake, better exhaust manifolds and, I'm assuming, cylinder head flow advantage makes it pretty even (both are running very similar MPH's ).......
Wonder what both cars weigh?
No replacement.. displacement, yada, yada, yada. When it comes to efficiently producing HP I've never seen figures given in HP/CFM. Now I've seen a lot of figures on many engines in terms of HP/CI!!!
I would guess the RR would be at least 3800 being all steal so it's probably giving up some there, too.
This post is available in double vision where drunk.
and, I'm assuming, cylinder head flow advantage makes it pretty even (both are running very similar MPH's 
)....... 
