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Rare earth spark plugs stay clean and maintain their set gap for a long time. The problems they can get into is the center tip runs very hot such that if you’re racing or running some form of super charge or nitrous boost they can become a source of preignition in a hard run motor. Plus since they don’t need to be changed often they are subject to thread corrosion with the cylinder head making them mighty difficult to change out especially with aluminum heads they will often fail the plug threads of the head even where anti-seize is used as that stuff doesn’t last forever.
To the end of keeping fouled plugs firing there is nothing like hitting the electrodes hard with the kind of power a 6AL box introduces across the plug gap. This also includes high quality low resistance wires. If you’re not running a capacitive discharge ignition like a 6AL for example there is no need for 10.5 mm wires as a standard HEI isn’t producing enough voltage to warrant that much insulation if you are running a Capacitive Discharge (CD) ignition then you can benefit from thick wires and should run separate grounds from the heads and intake to chassis in addition to the typical starter motor block ground cable.
Ignition wires should be spiral wound, these allow good electrical radiation suppression without using a lot of wire resistance to do it.
Bogie
To the end of keeping fouled plugs firing there is nothing like hitting the electrodes hard with the kind of power a 6AL box introduces across the plug gap. This also includes high quality low resistance wires. If you’re not running a capacitive discharge ignition like a 6AL for example there is no need for 10.5 mm wires as a standard HEI isn’t producing enough voltage to warrant that much insulation if you are running a Capacitive Discharge (CD) ignition then you can benefit from thick wires and should run separate grounds from the heads and intake to chassis in addition to the typical starter motor block ground cable.
Ignition wires should be spiral wound, these allow good electrical radiation suppression without using a lot of wire resistance to do it.
Bogie