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Old 12-18-2020, 06:58 PM
Lynn Lynn is offline
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The black stuff looks like deposits from octane booster. You wouldn't think it would need octane booster with flat tops. Can't imagine he put enough Sta-bil in there to cause deposits.

Pretty easy to isolate engine vibrations from anything else. If it is in the engine, it will vibrate with the car sitting still. If you suspect driveline, turning the engine off while coasting in neutral will eliminate the engine.
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Old 12-18-2020, 07:50 PM
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John Brown John Brown is offline
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Wrong flywheel/flex plate? Seen it happen way to often.
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Old 01-20-2021, 12:02 PM
Hotrodpaul Hotrodpaul is offline
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I would check the wires and cap, were they installed correctly with the firing order or was there a crossfire from one wire to another. Also was the engine balanced, possibly show some pics of the balancer and flywheel. Could be externally balanced parts? Just looking for any possible cause.
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