{Chrysler 300} Chrysler 300 NGK Spark plugs

[ridgleyracing65 <ridgleyracing65@xxxxxxxxx>]

I also have XR5 in my 300F. However, If you check with NGK, they cross reference the "standard" 413 motors to XR4 plugs (one heat range hotter). For how most of the cars are used today, this plug should be fine, and still provide plenty of "heat range" for some hard running. In the day, Chrysler expected the "letter cars" to be used considerably harder than the standard models, and spark plugs had much narrower heat ranges. In over 30 years of dyno testing, I have learned two important things, most people run too cold a spark plug, and engines need less fuel than you think.

Dyke Ridgley

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