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Re: spark plug indexing?
Like Marv, I haven't found any notable difference on the dyno or dragstrip to make indexing spark plugs worthwhile.
However, I do have to index my plugs because of the size and shape of the dome of my pistons and how close they come to the heads. In other words, if the ground straps are in the wrong position, the piston can kiss them and close up the gap.
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