I dont know but I use a mercury 5 hp longshaft and it goes through anything and is about as heavy as Id think you'd want

:: I'm not sure if there is a specific rating, however my
:: boat previously had an extra large engine and it
:: required internal reinforcement to the outboard hanger
:: tube on the transom and also cracked the bracket itself.
:: I'm not sure how big they went...
::

:: --brendan

::
:: :: I just acquired "Heineken" and want more power to get
:: :: through tidal currents. What the max hp rating for
:: :: Express 27 motor bracket?
:: ::
:: ::
:: :: Thanks,
::
:: :: Fredrik