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post #1 of 3 (permalink) Old 03-17-2011, 05:32 PM Thread Starter
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New Plugs

I have a 65 389 running 11:1 compr.
With the newer spark plugs and the choises out there, do the newer plugs offer better performance then the older standard plugs.
This is a car that has an auto trans and is street driven.
Just trying to get caught up on what works best
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post #2 of 3 (permalink) Old 03-17-2011, 07:07 PM
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I only use AC Delco in all of my G M cars.
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post #3 of 3 (permalink) Old 03-17-2011, 10:11 PM
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The newer platinum and irridium plugs are made to last longer to get new cars through the emissions warranty. They do not offer a better spark or better performance. They are tailored to vehicles that require major disassembly to access the plugs, so a plug change may only happen once or twice in the vehicle's service life. Stick with AC R44s or R45s and you'll be fine.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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