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Timing marks on crank shaft for a 1979 gmc?

Updated: 8/18/2019
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12y ago

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the line mark on the harmonic balancer is used in alignment with the original timing case cover on the face of the motor behind the water pump, On the case you will see a gauge, On the gauge you will see degree marks 4,6,8 12 , . You will align the mark with 0 degrees usally to get TDC, ( Top Dead Center ) and that is how that works hope it helped

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Q: Timing marks on crank shaft for a 1979 gmc?
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