not a 180 but i think when it was standard it may be able to get to its theoretical book top speed....
However i have been in ride in a heavily modifed 400 'tractor' as a passenger and i saw over an indicated 140mph and it was still pulling!
usually the derv's run out of puff at 4200rpm but his mods and fueling adjustments kept it going right up to 5000 or so iirc
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