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Thread: spark plug thread number 789
04-13-2010, 09:18 PM #1
- Join Date
- Jan 2010
- Central PA
spark plug thread number 789
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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