Oil Pump

Mopar Performance recommends using the chrome-moly intermediary shaft with the HV oil pump.
High volume pump = 25% more torque
High pressure spring = another 25% more torque

A HV oil pump pulls a quart of oil thru the pickup tube in one second at 7000 rpm. Combine that with oil sloshing backwards when leaving the line or sloshing forwards with hard braking. And add in the oil winding around the crank. Now you can imagine why in a borderline situation the use of a HV oil pump could cause issues. Baffles and larger oil pans are important.