It gives sense if you mean 6165CV.
Please see page 7, second item from top in this document: https://www.ekeving.se/div/rm/Frichs_dieselfordon_1936.pdf

4 pcs 6-cylinder diesel engines bore 165 will have 880 HP. Frichs usually included 10% overload in those days.

Nope!
The La Meuse high speed trains, which got the 6165CV engine, only had 2 engines (not 4).
Each engine were a V12 - one of the very few V-engines with the Frichs name on - and each engine were rated at 440 hp (inc. 10% overload).
If you happen to have "Jernbanen 2/2011" pictures and specification of the 6165CV engine can be found on page 38.

The regular 6165CA were a 6-cylinder, in-line engine used in the MP railcars.

The other V-engines with the Frichs name on will be:
DSB MT 151-167 - 8.220CV
DSB My 1201-1202 - 16.220CV2 (in reality a B&W design which Frichs build via a Licensee agreement).