Surging?
Surging usually occurs at idle and goes away at higher RPM's. It's always caused by a lean condition, usually a vacuum leak, or a very lean idle. At least that's my experience.
Not really too sure that this sounds like surging. Not too sure it sounds like imbalance vibration either. Wish I knew exactly what it is.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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