Max continuous power as specified in the POH/AFM for the PA-31-350 is 49" MAP and 2575 rpm.
Power required on the operative engine following an engine failure, according to the POH/AFM, is max continuous power.
In about 1600 hours on type I can't recall seeing a Chieftain making more than 44" boost on take-off with most of them making 41-42".
Worse, engineers refuse to set 49" because "bloody pilots will ruin the engines"
Better risk than ruining the whole aeroplane because you can't get book performance I would have thought
