I agree. I have been using a used 6' King Kutter finish mower for four seasons now. Correct me if I am wrong Guys but a person needs to match the horsepower with what the mower deck requires as well as the RPM. 8N is about 20 horse and can provide 540 RPM at the PTO shaft. Therefore, it should and does match my 6' King Kutter finish mower perfectly in accordance with King Kutter's requirements.
I can only speak for what my equipment requires.
Good luck this mowing season!