If you have an automatic it could be the balance weight on your flywheel. I don't know how much of a vibration that would cause though.
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1980 RX7 with 289 Ford V-8 bored .030 over, Very radical cam, Torker 2 high rise intake, Holley 650 Carb, MSD Nascar 6ALN ignition, MSD coil and distributor, Headers with dual open side exhaust. Over 300 horse.
1966 Mustang still in progress
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