It looks like if you just subtract 50 from each marker on the Y-axis you have the correct values. So peak torque at 4,790 RPM is actually around 285.
HP = TQ*RPM/5252.
So at 285 ft-lbs at 4790 RPM the HP should mathematically be at 260. With the Y-axis corrected 50 points lower, it looks like 260 matches the graph.
Peak horsepower looks to actually be 330 at 7090 RPM.
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