These are the NGK JCW plugs with maybe 1000 miles on them. The first pic of the cleaner looking plug is from #1 and the second pic is from #4. I am just curious if there should be this much difference in the way the plugs look. The other end of the plugs look great with no cracks or discolorations.

 

Looks like you've got some carbon issues in #4 (relative to #1), but other than checking your plug wires for resistance, not much you can do. How do the other two look?

 

The wires are new and so is the coil. #1 and #3 are clean. #2 is not as clean as 1 and 3 but not as burnt looking as #4. Do you think it's time for something like Seafoam through my vacuum line to clean carbon?

 

Tiny bit of carbon ... but looks ok.
To really do a plug reading you should run underload at op temp and shut off then remove plug.
What gas do you use?
How much Ethanol in you gas at the moment.
And the tip and ceramic looks the same and good

 

The tips and ceramic on the plugs look great. I don't have 93 octane available so I use Chevron 91 octane. I also dump Techron into the gas tank once in a while to keep things clean. I also changed my fuel filter last year.

 

A useful link to info about reading spark plugs is here:-

http://www.ngksparkplugs.com/tech_su...qs/faqread.asp

These are extreme examples though!!

From experience, to me it looks like your plugs are running too hot, the center insulator is tooo white and you could do with going one step colder in the heat range (on NGK plugs, say from a 6 (standard MCS) to a 7 (JCW spec). Or if your using a 7 already to go an 8. When running too hot the center insulator will burn off any deposits left by the fuel combustion and a cooler running plug has a shorter nose/center insulator, benefits include less wear on the plug and less chance of detonation/pinking.

Also if you look at the thread on the two plugs, there's a difference in the number of threads the combustion gas have travelled up, possibly the plugs weren't installed/tightened with a torque wrench which would also influence to a degree, the temperature of the plug shell when running and accounting for the difference in the colour of the deposits around the leading edge of the shell.