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05-10-2016, 08:55 AM
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CC Member
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Join Date: Jan 2003
Location: Austin, TX,
TX
Cobra Make, Engine: Kirkham 599 Polished Bronze
Posts: 551
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Not Ranked
Spark Plugs in Shelby Aluminum FE block
Does anyone know what the best spark plug combination is for the Shelby aluminum block? Mine is opened up to 510 CI.
Thank you.
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05-10-2016, 09:17 AM
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CC Member
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Join Date: Apr 2012
Location: Bay Area (Peninsula),
CA
Cobra Make, Engine: ERA 427, 427/487 side-oiler
Posts: 1,248
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Not Ranked
I use Autolite 3924 in my Pond 487. Not racing, not platinum, just copper.
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05-10-2016, 09:19 AM
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CC Member
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Join Date: Jan 2003
Location: Austin, TX,
TX
Cobra Make, Engine: Kirkham 599 Polished Bronze
Posts: 551
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Not Ranked
Thank you, I haven't driven it much lately since the clutch slave went out. Lots of starts to test. I'm sure they are fouled.
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05-10-2016, 09:33 AM
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CC Member
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Join Date: Mar 2010
Cobra Make, Engine: Sold - Shelby Cobra CSX6045, 468 ci all aluminum Shelby engine
Posts: 370
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Not Ranked
My drivetrain installer recommended NGK R5671A-7 or -8. I'm using -7 and have been fine. My engine is 468 ci.
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05-10-2016, 09:56 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: 9,415
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Not Ranked
Displacement doesn't matter, but compression ratio does.
For a lot of combos, an AR3924 will work. If you have a compression ratio over 11:1, I would start going down.
The AR plugs are much easier to read the strap, you just have to keep an eye on them if you spend a lot of time putt-putting around.
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05-10-2016, 10:51 AM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
Slightly off topic: I have a SB 408W that I use the 3924 plus in. Since most of my driving is local light-to-light, I have been considering a hotter plug. But I can't find any mention of 3925 or 3926 plugs anywhere. Other recommendations?
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05-10-2016, 11:08 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: 9,415
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Not Ranked
You can get both, but I wouldn't switch unless absolutely necessary. As hot as it gets down there, I wouldn't want to introduce any preignition.
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05-10-2016, 11:24 AM
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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
Im using AR 3924 in an aluminum block with aluminum heads. Comp is 10.85:1 and running 100 octane. Seems to work.
__________________
All that's stopping you now Son, is blind-raging fear.......
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05-10-2016, 11:29 AM
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CC Member
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Join Date: Jan 2003
Location: Austin, TX,
TX
Cobra Make, Engine: Kirkham 599 Polished Bronze
Posts: 551
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Not Ranked
Great feedback. Thank you, guys.
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