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GMC
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1990
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R 2500 P/U 2WD V8-454 7.4L
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Mechanical Specifications
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Distributor, Ignition
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Distributor Timing Advance
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Distributor Timing Advance
DISTRIBUTOR TIMING ADVANCE:
Degrees advance at engine rpm, no load, in addition to basic timing.
Mechanical advance distributors only.