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Old 06-05-2007, 03:17 PM   #1
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Default which spark plugs

i did a search, cuz i know i've seen this topic several times, but they're all buried.

i like autolite spark plugs, and some say 605'* and some say 606'*. i think 605'* are the "one heat range colder" plugs? what does this all mean, and how would it affect my performance and/or MPG?
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Old 06-05-2007, 03:26 PM   #2
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One heat range colder (or two/three depending on modifications) are typically used for supercharged (or turbo) cars, in order to help avoid KR. I don't see them causing you any issues though if you wanted to use them. And yes, the 605'* are one heat-range cooler.
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Old 06-05-2007, 10:02 PM   #3
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go whit the 605 if youre looking for performance a colder plug give a quicker spark but if youre looking for normal driving all weather plugs go stock
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