[blykins]

Chevrolet advertises the Corvette engine to be 460 hp with 6.2L. The 5.0 in the mustang is 420 hp.

I am not making those numbers up, doesn't take a rocket scientist to figure out which engine is more efficient at making horsepower.

And yes it is extrapolation, but it is reasonable extrapolation that all engine builders use. If the 5.0 added more displacement it would be head and shoulders above the Chevy engine.

I'm sorry, but your superior engine just isn't superior. Also, to add insult to injury, the 5.2 L Mustang engine makes over 520 hp.