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OK, I'll assume a late model Frontier? Maybe a D21? SOHC or DOHC?
Nonetheless, truck cam(s?) will be geared for low end, so use ~6000rpm as a good redline.
The bottom end of all the KA's are quite similar, and that's what really limits RPM...but for your purposes, 6k is safe, and you'll most likely not make power above that...so why push further?
- Brian
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