[DeTomaso] Spark plug question

[asajay at asajay.com]

I HATE PLATINUM plugs in a 351C.  Tried them once, NEVER again.  Ran  
GREAT for a little while... six months later, performance was  
suffering badly.  Changed to NGK UR4 and never looked back.

Platinum (for me) just don't see to be a good choice for a big old  
fashioned iron V8 like the 351C.  I would pull them and toss them  
about as far as I could chuck them.

Now with that said, some of the plugs look fine, but one or two look  
like you are getting some oil fouling.  That could be rings, valve  
stem seals... OR simply poor plug performance allowing more oil to get  
into the cylinder by not firing well enough to properly pressurize the  
cylinder.

Did I mention I HATE platinum plugs?

Asa Jay
(AC Delco, Bosch, Champion and anything else except Autolite or NGK  
will not work in a 351C)

Quoting Brent Stewart <bjbstewart at yahoo.com>:

> All,
>
> I changed mu plugs for the first time in a year and didn't think   
> much of it. It was my first change since owning the car, and I was   
> actually surprised at how easy it was. The previous owner said that   
> he had just changed them before I purchased the car. I wasn't   
> changing for any particular reason other than I was doing annual   
> maintenance and figured I should before Reno.  I replaced them with   
> what was currently installed - Autolite Double Platinum APP 25's.
>
> Upon taking it out for a quick test drive, i was REALLY surprised at  
>  how much more powerful and, well, quick it was! Throttle response   
> was much better, acceleration was more than noticeably better. While  
>  initially excited about my findings, I soon began to try and   
> understand why this would have had such a big impact.
>
> Here are my questions.  I went back to study the plugs I had   
> removed. One thing I was immediately bothered by was the amount of   
> oil around the threads. I don't recall that as being normal.  I   
> don't have leaks, and the engine certainly doesn't smoke, but it is   
> an internally stock engine with 72k miles.  Also, how do the plugs   
> look?  There seems to be a lot of build up around the base of the   
> plug, but he tip looks clean?  Take a look at the pictures and let   
> me know what you think.  Appreciate any feedback!
>
> Single plug:
> http://tinyurl.com/cxsalk
>
> Several other picts:
> http://tinyurl.com/d5rguw
>
> Thanks!
> brent
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