63 Corvette HHP harmonic balancer bolt. If you are sure that your car has the orignal bolt holding the balancer onto the crank could you please tell us if it has the hole in it. Also tell us what kind of star washer you have. Inside or outside. Should be inside star washer on 63 Corvette. Typically the majority of these bolts are TR in 63. But there may be other companies. Over the counter replacments were LE's. They had the holes for sure. Thanks very much, John
63 340-360 HP bolt survey
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