Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Spark Plugs: Projected vs Non-Projected Tip
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Old 07-17-2012, 10:02 AM
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Older hi performance engines with higher compression ratios ran hotter plugs with exposed or extended tips. They were designed to run those plugs and work well with them. You can't get more hp or better performance by just tossing in a plug with a certain length electrode. You need to stick with the plug that works with your engine stock, or with whatever mods were done to that engine.
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