Spark plugs

I was using the motorcraft coppers that were 2 steps colder than stock. Once I moved to Denver I went to one step colder due to elevation.

These is an article online http://www.crownvic.net/tech/sparkplugs101.htm

Some more good reading.

I didnt find the exact thread I was looking for but the article ^^^^ is pretty helpful

http://www.lincolnsofdistinction.org/vbulletin/showthread.php?t=1956&highlight=spark+plugs

http://www.lincolnsofdistinction.org/vbulletin/showthread.php?t=1922&highlight=spark+plugs
 
I live in California so I am around sea level. My mark is my daily driver and I just want reliable plugs.
 
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