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Went looking for new plugs for my '93 vulcan and see about 4 different spark plug reach parameters available - .708 - .795 - Is there one optimal for performance? I notice the heat ranges range from 3-5 any difference there? Thanks for any input.

Splitshot
 

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Yeah, use the Motorcraft or Autolite OE specific plugs and no others. There is only one combination or heat range, reach, displacement and gap that will really deliver trouble free and optimum performance. I recommend getting them through RockAuto Auto Parts because their catalog is spot on.
 
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