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05-04-2007, 06:52 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 19,001
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Not Ranked
Boss 351 spark plugs?
Anyone out there with thoughts regarding spark plug choice for a Boss 351? I am currently running Autolite #25. Figured that this forum is the best place to start tech question since many of you are in the know. At least more so that the local Autozone.
Thanks for your input!
Jeff
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05-07-2007, 08:08 AM
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Renegade Nuns on Wheels
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Join Date: Aug 2001
Location: columbus,
Oh
Cobra Make, Engine: Unique 427 roadster with 351C-4B
Posts: 5,129
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Not Ranked
Autolites is what I use. Read the plug to see if it is to hot or cold... but be careful! There are lots of fancy, high tech plugs out there but I have never had an issue with the basic Autolite in my car.
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05-09-2007, 05:54 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 19,001
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Not Ranked
Thanks for the input, what # Autolite do you run?
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05-09-2007, 07:59 PM
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Stolen Avitar
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Join Date: Oct 2004
Location: Brunswick,
GA
Cobra Make, Engine: BDR 1311 428PI
Posts: 3,044
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Not Ranked
AF24s have worked well in my 372 Clevor with 4V heads. I would think that they would work well in your combo also.
Steve
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05-10-2007, 08:23 AM
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Renegade Nuns on Wheels
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Join Date: Aug 2001
Location: columbus,
Oh
Cobra Make, Engine: Unique 427 roadster with 351C-4B
Posts: 5,129
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Not Ranked
Just the basic autolite 25. They also have a platinum, double platinum and xtreme AP25, APP25 AND XP25 respectively. Never had any problems with the basic autolite but I don't see why the upgraded plugs would be a problem either. If you are not getting sooty carbon deposits on the insulator around the center electrode, it is hot enough. If it has a speckled appearence, it is to hot. Be VERY careful increasing the temp of the plug (IE 26). Generally, the more performance oriented the colder.
Last edited by rdorman; 05-10-2007 at 08:32 AM..
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05-12-2007, 06:27 AM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine:
Posts: 4
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Not Ranked
I have a 351 stroked Clevland with 8 TWM trumpets controlled By Motec. One plug in particular is oily and is always black, the others range from black to light biscuit color. Car performs well approx 500 rear wheel hp. How do I get clean consistant plugs
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05-14-2007, 06:35 AM
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Renegade Nuns on Wheels
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Join Date: Aug 2001
Location: columbus,
Oh
Cobra Make, Engine: Unique 427 roadster with 351C-4B
Posts: 5,129
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Not Ranked
Quote:
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Originally Posted by Peo
I have a 351 stroked Clevland with 8 TWM trumpets controlled By Motec. One plug in particular is oily and is always black, the others range from black to light biscuit color. Car performs well approx 500 rear wheel hp. How do I get clean consistant plugs
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While I have heard of your induction system, I have zero idea on how to tune it. As for the black plugs, they are either oil or carbon fouled. Shiny for oil and dry and sooty for rich fuel mixture. Obviously, get the fuel system tuned right for carbon and look at the mechanical condition for oil fouled. |
05-14-2007, 07:33 AM
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CC Member/Contributor
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Join Date: Feb 2000
Location: Greenville,
SC
Cobra Make, Engine: 70 Shelby convertible, ERA-289 FIA, 65 Sunbeam Tiger, mystery Ford powered 2dr convertible
Posts: 12,696
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Not Ranked
I've been running Autolite AP24's in mine without ever an issue.
Bill S.
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