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I'm pretty sure the OP didn't say 2500rpm, someone mentioned that was the best BSFC and then someone else got confused.
800rpm is definitely not good for the engine and 1000 probably isn't either. Most cars' owners manuals tell you explicitly to not put heavy load on the engine at low rpm (with manual transmission). Even if you had sufficient oil flow to protect the bearings (which is debatable, on a typical engine I would guess it's not entirely adequate), the cylinder walls are not under hydrodynamic lubrication even with piston squirters and high load at low engine speed will squeeze the oil film out.
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