View Full Version : Plugs - Spark plugs for a Northstar ??

04-30-12, 09:24 PM
What is the best sparkplug to put in the Northstar ? I have 116 k on the same set of plugs and think it is time to replace them .

04-30-12, 10:06 PM
AC Delco, these engines don't like any other, go with the same for the wires

04-30-12, 10:22 PM
Update your profile to show your model and year. It will help us help you.
pre-2000 A/C Delco 41-950
2000+ A/C Delco 41-987

05-01-12, 07:00 PM
Sorry , 2003 DeVille with 116,000 on the clock

05-02-12, 09:08 AM
Sorry , 2003 DeVille with 116,000 on the clock

Update your profile "What I drive" - and your login header will change to something like ours ^^^. You can supply a bunch of necessary, oft-repeated info that way...........

You may find that your original plugs are DENSO models - not to worry. DENSO makes the AC Delco platinum plugs for Cadillac: the AC Delco #41-987 is the same plug. Read the box. Some of the 2002 - 2003 owner's manuals still listed the DENSO plug number.