Proof of higher performance engines on the way. Not many people would pay $5k to hand build their LT1.

 

It may even be the time it takes the flamefront to propogate across the bore. It may be that x size bore will not allow all of the fuel to burn no matter how it is introduced. Just spitballing, but not feeling confident about a 7.0 Gen V, as badass as it would be.

 

That didn't even cross my mind since modern fast burn combustion chambers seemed to have licked that problem, discounting the sheer sixe of the motor, is the LS7 considered a "dirty" engine?

 

Dual spark plugs - problem solved.

 

Does Dodge still do that in the Hemi? Are all versions (5.7, 6.1, 6.4)Dual spark plugs?

 

I do not have first hand knowledge, but from some things I read, it was close to line. I would think that no matter how good the heads, at a certain bore size, you would outrun the maximum flamefront speed and leave unburned fuel. As emissions tighten, I would think that the limit would decrease as well. I am speculating, and probably talking way over my head, but it makes some sense. The LS7 may not be terrible for its size from a mpg number, but it could be from a particulate point of view, but I do not have any numbers.