Are you talking about planes that saw combat in WWII?
I have read of accounts of P-47 M's clocked at 490mph in level flight.
The Republic XP-47J Superbolt, a lightweight version of the Thunderbolt with the same engine as the "M" and "N" model (R-2800-57(C)), had a maximum speed of 507mph.
It weighed in at about 2,000lbs under the "D" model in combat loaded trim.
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August 12, 1944 - In an armor cover mission at the Falaise track, Charlie Rife, 368th FG, 395th FS, takes 37mm fllak rounds to both wings. His wingman, Richard Kik, takes a 20mm round to the engine that knocks out two cylinders. Both make it back.
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