Why do Mopar Engines Have a Different Sound From Chevys and Fords??

Well, there's two design elements that BB chevy and ford share, that mopars don't. The first, Mopar Big Blocks are a wedge head, While ford and Chevy are both Canted-valve designs. And second, Everything mopar makes uses comparatively ENORMOUS connecting rods to the equivalent ford and chevy designs. Which translates to higher piston speeds and a different "hit"

And the hemi just plain can't compare to anything else. It's as different from other canted-valve motors as the wedge motors are.

I'd also like to point out, the Ford modular motors have a distinctive sound too, that is unmistakable, I'd say to an even greater degree than Mopar motors.