Why is it...

Here`s one that has me confused. Chevy cams are listed from 0-6000 rpm power band and Mopars always seem to start from 1800 to 5800 ???
Well, cause the 350 is the best engine ever! My neighbor put roller rockers on one,and it had an instant 700 HP! He'd always threatened to jump over my Dodge truck w/ a mash of the pedal! Never did, when called out... lol