The damage recently done

Jeff, for what it's worth. My Lemans that I raced for almost all my time in class racing started racing life as a bracket car. My first engine was a TRW piston, stock shortblock with d port 4 barrel heads and a Torker intake. The valvetrain consisted of a Crane Blurprint 041t cam and stock rockers.
The duration on that cam at .002 tappet lift was 308 in 320 exh. At .050 231 int 240 exh. 114 LC. That cam idled at 900 rpm with 14 inches of vacuum. I ran 12.18 109 in a 3700 pound car with 4.10 gears and 28 slicks.
That cam was right from Crane. The lobes were in the right place, and it had slow ramps. This is the way those cams were, like it or not.

Originally Posted by Jeff Lee

Pontiac had advertised durations that far exceeded the actual duration (which was no slouch for the day). And of course it matters where this figure was obtained from (.002, .005. etc)
Pontiac did this for class racing. If a cam had an actual 320* of duration, I'm not sure it would run!

I also had a real deal RAIV / 4-speed / 4.33 rear '69 GTO. Can't imagine what that must be like in a '69 Firebird!