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spark plug thread number 789

Discussion in 'Performance & Fuel' started by KaztheMinotaur, Apr 13, 2010.

  1. KaztheMinotaur

    KaztheMinotaur New Member

    99 NBS w/ 4.8L

    I know that AC Delco plugs are preferred and that the Iridium are the prefered AC Delco plugs. The ones I got say Rapid Fire Platinum, part number 12, and also have 19238463. They are the first AC Delco option on Rock Auto.

    How are they?

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