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To fully forge my bottom end? My cam is desinged to wind up to 7k and unfortunately now I'm only running it to 6400 to be safe. Any ballpark figures?? I haven't yet looked into this..
From what I hear you may have problems with the 4l60e (and the opti) at 7k shifts. But for the bottom block I would say if you go fully forged you would be safe enough to 7000rpms