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1977
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Forward Control 5.7L Eng VIN L, Automatic Trans, Trans Mfr CD 400/M40
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Vacuum Advance Spark Control
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Vacuum Advance Spark Control
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Description
Trapped Vacuum Spark
Spark Control Switch
Operation
Trapped Vacuum Spark
Spark Vacuum Delay