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Originally Posted by lineslinger
Naumoff
Why does the alloy of the head dictate a different plug, is it the heat retention of the alloy with which the head is made?
Does the multiple spark given by the MSD during the firing stroke have an influence as well?
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As Morgan said the Edelbrock Alloy heads have a smaller plug tap diameter.
Morgan, You are right about no HP gain for gap. With our engines running 10:1 compression or higher a smaller gap is fine. A larger Gap would be needed for a low compression engine.
The multispark is to make sure that the fuel in the cylinder fires. It is a better chance NOT to have a misfire in each cylinder.