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The Pertronix cylindrical coil, shown here, is of the same type and construction as discussed earlier. It has an iron core to enhance the magnetic field and is oil filled to aid in cooling. The heavy-duty 8mm Flame Thrower spark plug wires shown are superior to OE sizes because, in addition to having a heavier center wire, they also have thicker insulation to prevent accidental grounding in the form of arcing to exhaust manifolds or cross fire. Such robust plug wires are also more resistant to extreme heat, making then a must for use with headers.