Looking at P40 Speed Performance Numbers...

[ElAurens]

Here are the engine types and ratings for various Hawk 87s...

P-40D, E and E-1: V-1710-39/F3R
T.O.: 1150bhp @ 3000rpm @ Sea Level. Manifold Pressure 46.2" HG.
Military: 1150bhp @ 3000rpm @ 12000ft.
Normal: 1000BHP @ 2600rpm @ 11000ft. Manifold Pressure 38.7" HG.

P40F: V-1650-1 Merlin
T.O.: 1300bhp @ 3000rpm @ Sea Level. Manifold Pressure 54.3" HG.
Military: 1240bhp @ 3000rpm @11800ft. Manifold Pressure 48.2" HG.
Normal: 1080bhp @ 2650rpm @ 9500ft. Manifold Pressure 44.2" HG.

P-40K: V-1710-73/F4R
T.O.: 1325 @ 3000rpm @ Sea Level No MP given.
War Emerg. : 1550bhp @ 3000rpm @ Sea Level(Rammed)
Military: 1150bhp @ 3000rpm @ 11800ft.
Normal: 1000 @ 2600rpm @ 11000ft.

P-40M/N-1: V-1710-81/F20R
P-40N20/-35: V-1710-99/F26R
P-40N-40: V-1710-115/F312R
T.O.: 1200 @ 3000rpm @ Sea Level
W.E.: 1360 @ 3000rpm @ Sea Level(Rammed)
Military: 1125 @ 3000rpm @ 14600~15500ft.
Normal: 1000 @ 2600rpm @ 13800~14000ft.