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08-11-2015, 12:38 PM
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CC Member
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Join Date: May 2007
Location: San Diego,
CA
Cobra Make, Engine: '66 GT350 Tribute
Posts: 13
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Not Ranked
Spark Plugs Condition
Hey everyone,
I have 500 miles on my rebuilt 1993 5.0 engine that's running a B cam, dual plane Cobra intake, full headers to 2.5" side exhaust, and a Holley 600 carb in my '66 Mustang. I pulled the plugs yesterday and wanted to get everyone's opinion on how they look.
Thanks!
Brent
Cylinders 1-4 (Passenger side): black background
Cylinders 5-8 (Driver Side): blue background
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08-12-2015, 07:20 PM
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CC Member
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Join Date: Aug 2009
Location: Phoenix,
AZ
Cobra Make, Engine:
Posts: 1,956
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Not Ranked
All your plugs look great.
__________________
FFR MK1---Sold
Superformance #884 --- Sold
No more Furds.
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08-12-2015, 08:20 PM
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CC Member
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Join Date: May 2007
Location: San Diego,
CA
Cobra Make, Engine: '66 GT350 Tribute
Posts: 13
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Not Ranked
Thanks DWRAT!
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08-13-2015, 07:05 AM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
great site for sparkplug reading
sparkplugreading
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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08-13-2015, 07:10 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
A little rich on the idle, need to pull a degree of timing out, and a lug nut on your rear passenger side wheel is loose.
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08-13-2015, 11:22 AM
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CC Member
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Join Date: May 2015
Location: Sykesville,
Md
Cobra Make, Engine:
Posts: 32
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Not Ranked
Look almost darn near perfect!
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08-13-2015, 02:56 PM
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CC Member
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Join Date: May 2007
Location: San Diego,
CA
Cobra Make, Engine: '66 GT350 Tribute
Posts: 13
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Not Ranked
Thanks everyone! Dwight, that spark plug site is great. Blykins, if you can tell that from my plugs you should take up poker!
I honestly thought they might be a bit on the lean side due to the light tanning on the porcelain.
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08-13-2015, 03:02 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
That color is pretty much optimal. When they start getting glistening white and you have issues.
By the way, I was serious about two out of three of the things I said above…
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08-13-2015, 06:26 PM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Not Ranked
Cocoa brown and look very nice to me. 
__________________
All that's stopping you now Son, is blind-raging fear.......
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08-13-2015, 10:01 PM
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CC Member
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Join Date: Aug 2009
Location: Phoenix,
AZ
Cobra Make, Engine:
Posts: 1,956
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Not Ranked
Quote:
Originally Posted by blykins
A little rich on the idle, need to pull a degree of timing out,
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Explain your advise please.
Mostly the part about timing, what tells you to pull timing a bit?
Dan
__________________
FFR MK1---Sold
Superformance #884 --- Sold
No more Furds.
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08-14-2015, 05:47 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
The base ring shows to be a tad sooty, most likely because of a rich idle.
If you look at the heat mark on the ground strap that will tell you a lot about where the timing needs to be.
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