> Based on this news I tried the Autolite 3923 (one range colder) at the track
> in November (stock ignition) and have left them since. So far, I'm very
> satisfied
> with them ... no fouling with street driving as yet and idle is smooth. The
> Autolite 3924 are the stock heat range. The books actually have them listed
> to be used in the 5.9L engine and the Autolite 5224 (stock range) for the
> 5.2L engine.
>
If the 5224 is the stock plug for the 5.9L, what is the plug that is one
range colder for the 5.9L?? (5223 maybe??)
Thanks!!
Clay
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