You're spot on pishta ! (5250 rpm)
I've seen this kind of thing before, in the 80's with HR Magazine. They would do an engine build with their beloved 350, then brag, brag, brag about how much power it made..
But I noticed they were puffing the numbers above the 5250 mark. (curve looked suspect)
They weren't smart enough to bring up the torque values with it, so when I did the math, they were actually 45-50hp short of their claims.