The 27hp is probably rated in static conditions, such as full engagement at full throttle while sitting still, as in traffic, where actual dynamic also involves forward vehicular movement at 70mph, in 4rth overdrive with TCC locked up, and a great volume of 70mph air forced thru the radiator by that forward movement.
27hp is simple scare tactics, imo
jd
'96 Dodge 3500HD cc 2wd drw............'89 GMC 3500 cc 4wd drw
5.9 12v #10TST 6sp SBC13-1.375.......6.5TD EFI maxEtorq v2.0 DSG
DODGE makes it CUMMINS shakes it.....4L80E 205 4.10 Dana60\70HD
6 in a row makes it go.......................Grandpa's big truck