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The class refers to the cable's working temperature. From Bougicord's web site:
"Grades indicate the different temperatures that the cable can withstand.
Depending on their engine specification, vehicles require ignition wires cable that can withstand more or less heat. Grade F is designed for withstanding the highest temperatures."
The table below will probably come out in a mess, but you get the idea:
Cable grade A B C D E F
Maximal temperature (°C) 80 100 120 140 160 180
Minimum temperature (°C) -20 -30 -30 -30 -30 -30
Thermal overload temperature (°C) 105 120 155 180 220 250
Erling.
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1987 240 GL 82K miles
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