VH-XXX
It won't be a constant 155 hp, there would be a time-based limit. No engine as far as I know is approved to operate continuously at its' maximum horsepower.
Just for the record ...
Narrow deck Lycoming IO-540
POWER PLANT
1. ENGINE
a) Manufacturer Lycoming
b) Model IO-540-E1B5
c) Fuel 100/130 Octane (Minimum grade)
d) Oil grade Per Mil-L-22851. See Lycoming Service Instructions
e) Engine Operation Limitations
CONDITION
--- --- BHP
--- RPM
--- TIME
Takeoff
-------------290
---2575
---- No Limit
Max cont at SL
-----290
--- 2575
---- No Limit