In my '69 Bird, the 406 Pontiac - was spun up to 6300 RPM on the dyno (hp was steady/strong at that RPM according to my engine builder). However, the bottom end has had some work done to it (mag'd and shot-peened/polished rods, ARP rod-bolts, a bit of work to the crankshaft, etc., etc.). I likely won't spin it any higher than 6100 RPM. This will eventually be more of a race car (once my GTO is back together) with occasional street use.
For my '72 GTO the rotating assembly is mostly stock (ARP rod bolts, stock crank). I keep a 5800 RPM chip in the MSD - and I believe it bounced off the limiter (once) at the track. This will be a street car (going forward). I won't be tracking this car anymore (unless it is to go through a road-course).
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