990 HP: 40.4 or 42.0?

[farmlegend]

JD banner page suggests an engine HP of 42, whereas the "specs" indicate 40.4. What's with that?

http://www.deere.com/en_US/ProductCatalog/GC/series/gc_cut_90_series.html

 

[MarlandS]

Put it on a dyno and it'll probably different yet. It's not uncommon for differing publications from a company to show different HP ratings.

 

[rockyridgefarm]