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Discussion Starter #1
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
thanks:confused
 

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8,569 Posts
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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