The F4U Corsair, produced by Vought during World War II, was a highly capable and iconic fighter aircraft. However, there seems to be a mix-up in your question. The F4U Corsair was not followed by an F4U Corsair II. The Corsair II refers to a different aircraft, the A-7 Corsair II, which was a ground-attack aircraft developed in the 1960s.
To clarify, the top speed of the F4U Corsair, the World War II-era fighter, varied depending on the specific variant and conditions. The maximum speed of the F4U Corsair ranged from approximately 395 to 425 miles per hour (or around 635 to 684 kilometers per hour).
On the other hand, the A-7 Corsair II, a completely separate aircraft, had a top speed of approximately 693 miles per hour (or 1,115 kilometers per hour). The A-7 Corsair II was a subsonic aircraft designed for ground-attack missions, and it served with the United States Navy and the United States Air Force during the Cold War era.