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Motor has slight tap/knock...has been like this for at least two years. I drive this car 100 miles a day on my commute. Would not hesitate to drive this car anywhere. Car recently started pinging under hard acceleration in warm weather, not sure why, i've always run super unleaded
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sell it with out the motor?
generally when a ls1 gets those symptoms it is a matter of time before piston 4 go's out the bottom..
tap/knock might be piston slap but pining is concerning.
Do you have any more information any videos or sound clips of the sound?