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#12
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I have been using a NGK racing plug with heat range at 6 and have tried 7.
Called NGK last week and their "performance" guy told me that I should use an Iridium IX plug with extended tip with heat range at 6. Went and bought some but have not tried them yet.
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1970 Chevelle SS LS5 - 79k original miles, Tripple Black, build sheet 1969 Camaro SS/RS X22 - 548 with 5 spd, Hugger Orange, Houdstooth Interior |
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