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Old 12-04-2010, 06:04 PM   #3 (permalink)
Ryland
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Most modern combustion chambers are shaped to work well with standard plugs, the +4 plugs seem to work best in large American engines.
I can't remember the details but the SAE wrote and published a paper on spark plugs a while back and explained how those plugs work in comparison to standard style plugs.
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