Because he's wrong, that's why. Do you think for one minute he knows more than the engineers at Isky? The first cam you had is pretty close to the factory 340 cam and they routinely pulled to beyond 6500, plus yours was a solid. I like the new cam though. It's kinda rowdy. Sounds good. My end opinion is, if you're happy with how it runs, don't worry about all the supposed forum gurus.