I don't have a B65 but I believe the CV III engine gives you higher overheat speed because the OH % of the engine is higher.
So instead of just looking at the horsepower, look at the OH % too, there are some engines with lower horsepower than one engine, but will give you a higher overheat speed.
Also, for the most part, once your engies can hit the OH speed cap, this usually won't matter.
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