A while ago I thought that my engine was out of balance too, it ran rough, but the motor only had a couple g's on it and it was properly balanced. It turned out as I was under the car one day, I had loose bolts at the collector which caused an exaust leak that was almost inaudible. I installed dead-soft alluminum gaskets and the engine has never run smoother!! Just an idea! Good luck -Matt
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66 coupe: 351W 30 over. Fiberglass shelby parts + flares
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