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On our racebikes we found that with a VERY efficient ram air system and sealed air box we didn't see any positive pressure to offset the vaccum on the engine till at least 90 mph.
Keep in mind, this is on a much smaller engine; 600cc's.
I wouldn't even want to try to figure out at what point a 6.2 V8;s vacuum would be overcome.
Good info, thanks Ted!
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