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JWT raises the rev-limiter on the GA16DE to 7300 rpm's. If you can confirm that the two motors have the same connecting rods then I'd say 7300 is safe. Aside from the connecting rods valve train harmonics play a huge role in how high an engine can rev and at that range (8000) RPM's you will want to look in to different valve springs designed to work with your cams.
And I gotta ask, why have you let it rev that high on more than one occasion?
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