Need Spark Plug Reccomendation
04-19-2007, 01:12 PM
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Need Spark Plug Reccomendation I have a 383, about 11.5:1 cr with the AI 190cc Head Package and a .236 .242 116 lsa cam with all bolt ons. We've had it tuned, but not on a dyno yet, going to get an Edge racing converter. I fouled out my NGK TR55 Iridiums b/c it's running rich. Should I go up a heat range? What kind of plugs have you guys successfully ran on similar setups?
04-19-2007, 01:52 PM
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I would recommend a regular copper NGK TR55 with around .045 - .050 gap. I have never been a big fan of the Iridiums since the tip is so small they tend to blow out easier. I would get the tune sorted out though instead of trying to fix it with a hotter plug. Because even if it was rich at idle or part throttle you could burn it up under wot.
