Not in a A Body but listen to this small block scream!

toolmanmike said

I don't see a purge and think the run would be too long for a blast of gas. The engine didn't change pitch much like it does with No2.

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I have seen many pulling trucks running nitrous through the entire run, AFTER the clutch is fully engaged. I agree though that this one does not appear to. She sure is a banshee though!