True the right Mopar specific lobes can net huge gains, but it depends on what You're starting with. Run of the mill Comp Magnum to Extreme Chrysler hydraulics, big, MM or MX lobes humongus. But if You start with an Extreme Energy 284° .842" lifter profile, to a Purple Plus 284° .904" lifter profile, it is actually a tick smaller, both are rated advertised @.006" lift. You need to know what Your engine wants, & what quality of valvetrain You're willing to purchase, high lift rates are harsh.