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Alot of this depends on whether or not the engine has had time to warm up to typical driving conditions...Dry reving is one of the worst things you can do for a stang over 3k rpms
For a stock 'A' code, 5000 RPM max, butI don't put mine up that high. On the other hand, on my fresh broken-in Hi-Po, Iwould shift at 7,200 RPM, mostly by ear.
Jim