As far as I know a 6500 redline tach wasn't available in '69 Camaros. There was a 5000 redline 7000 tach in the SS 350's, a 5500 redline 7000 tach in the 325/350HP 396's, a 6000 redline 7000 tach in the 375HP 396's, And a 6000 redline 8000 tach in the Z28's. I have been wrong before.
So what is GM's thinking on red line numbers? They change the red line from 6000 to 6500 and use the exact same driveline? I would think they would have the numbers calculated out a little better than that.
Redlines weren't set based on powertrain capability or power curves - they were set based on warranty expectations (which doesn't explain the very late-'69 Z/28 500-rpm redline increase); when marketing is involved, some things just "happen"
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