Again, incorrect. Read the pilot's manuals.
Pilot manuals change and evolve. I prefer actual engine documentation. I have a copy of TO 01-25CF-1 (P-40D/E/E-1) pilot's manual of December 1942 and a 1944 addition as well.
There is conflicting data on the engine rating, and it depends upon the general time frame.
As far as I can determine, in late 1942, the P-40E SEFC was updated to include a WEP rating of 56 in/hg. Prior to that, I can find no WEP rating in any documents.
Let's stick to the rating of the P-40E when deliveries began in August of 1941.
Download and read this document:
http://www.raafwarbirds.org.au/targetvraaf/p40_archive/pdfs/P40E-%20RAAF%20T%27ville%20test.pdfYou'll note that there is no WEP rating.
No WEP rating here either.
Nor here....
Not even here.
Where you find a WEP rating is in the late 1942 manual, reflecting an uprating of the engine.
So, you can argue either side of the coin. However, the uprating does not appear until after all 800 P-40K-1 and K-5 (short fuselage) fighters were delivered with the V-1710-73 (F4R), with a WEP rating of 1,550 hp at 56 in/hg. By 1943, most E models still in service were retrofitted with the -73 (or a remanufactured, upgraded -39) as -39 had long since ceased production. Hence, the uprating in the SEFC.
If you have an SEFC chart dated prior to 1942 showing the V-1710-39 with a WEP rating, please post it. I'd very interested to see it.
My regards,
Widewing