Appreciate those experiences Bob. I pulled the
3924's out and they still looked good. Now the
3923's are in for the test. I do a lot of hwy
miles so they should work great.
Thanks
GS -
>
> I put in 3923s last fall with little over a month left in the track
> season (replacing the Champion Truck plugs) and ran them over the
> winter in mainly city driving. I had decided to check the Truck
> plugs after reading posts about their wear. Sure enough, they
> showed wear ... plus gaps were largers than when originally set.
>
> I pulled the 3923s in prep for opening day at the truck. They showed
> no wear and were rust-coloured (a normal appearance from what I read
> on a site on spark plug readings). As a matter of fact, my first
> impression as I pulled them was that they looked new except for
> the colouring.
>
> I found that, with non-agressive type of city driving, they will
> exhibit very minor and infrequent symptoms of fouling but a mild
> acceleration (city not highway) cleared it up.
>
> If it were not for going to the track, I would probably try the
> normal range 3924s.
>
> BTW, the owner of the auto. supply shop that I got the plugs from
> and who referenced his books said that the 392x family were listed
> for the 360 engine while the 592x family were listed the 318s and
> because of their (592x) size were truck-oriented plugs.
>
> Just my experiences.
>
> Bob
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