I didn't want to make an essay out of this either, sorry if I rambled.
Back to the cam duration question. Crane Cams, way back when, pioneered the duration @ .050" cam lift as an industry standard for cam profile comparison. Prior to this, there was no way to compare one cam to another. "Advertized" duration of say 292 was actully a 222 @ .050" after the opening/closing ramps had been factored out.
You can still get a nasty "Rumpeta-rumpeta" idle with a 224 - 234 degree cam (@ .050") with good street performance.
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