What spark plug are you using in your stroked Hemi
#2536207
08/14/18 03:23 PM
08/14/18 03:23 PM
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Posts: 3,391 cheshire, ct
davesmopars
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What spark plug are you using in your stroked HemI street car pump gas thanks
Last edited by davesmopars; 08/14/18 03:37 PM.
Keeper of the 440 M code Cuda registry mcodecuda@yahoo.com
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Re: What spark plug are you using in your stroked Hemi
[Re: davesmopars]
#2536663
08/15/18 11:25 AM
08/15/18 11:25 AM
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Posts: 13,319 Marion, South Carolina [><]
an8sec70cuda
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NGK 4554 (R5671A-8) in my 11:1 pump gas (93) 572" Hemi. I use these when I run it NA and on the street. I throw a colder set in it for nitrous use.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: What spark plug are you using in your stroked Hemi
[Re: davesmopars]
#2536715
08/15/18 01:07 PM
08/15/18 01:07 PM
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davesmopars
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It's a 604 aluminum head 10.2 compression it this make a difference
I have written on paper work I think this what it says real bad writing NGK NY9 NGK N 11 (i think)
Champion RN11Y
Then say start with 9
This was written in the notes, very messy hard to read
Last edited by davesmopars; 08/15/18 01:12 PM.
Keeper of the 440 M code Cuda registry mcodecuda@yahoo.com
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Re: What spark plug are you using in your stroked Hemi
[Re: davesmopars]
#2536727
08/15/18 01:28 PM
08/15/18 01:28 PM
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Posts: 43,007 Bend,OR USA
Cab_Burge
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Champion numbers tell you about the plugs, if you wanted to start with RN9YC,R= resistor plug, N=13/16 socket size with 3/4 inch thread length, 9= the heat range , bigger #s are hotter, smaller are colder in Champion plugs Y= extended spark plug ground strap, C=copper core. On your deal I would start with a cold plug like the RN9YC or the smaller 5/8 socket size RC9YC plugs IHTHs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What spark plug are you using in your stroked Hemi
[Re: Cab_Burge]
#2536786
08/15/18 03:30 PM
08/15/18 03:30 PM
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Champion numbers tell you about the plugs, if you wanted to start with RN9YC,R= resistor plug, N=13/16 socket size with 3/4 inch thread length, 9= the heat range , bigger #s are hotter, smaller are colder in Champion plugs Y= extended spark plug ground strap, C=copper core. On your deal I would start with a cold plug like the RN9YC or the smaller 5/8 socket size RC9YC plugs IHTHs I agree with cab. No need to mess with the N series Champion plug. Just use the C series and that way you get the 5/8 hex instead of the big, clunky 13/16 hex. If you think you need the 11 heat range Champion, I don't think they have that in the C series. Don't have my catalog handy but if that's what you need, you can use the RC12YC instead. At 10.2:1 compression and pump gas my guess is you'll need the 12 but I'd start with the 9 and work with it. Easier to tune up to a warmer plug than it is to start on the warm side and have issues. IOW, I start colder and then use a warmer plug if I need it.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: What spark plug are you using in your stroked Hemi
[Re: davesmopars]
#2536798
08/15/18 04:07 PM
08/15/18 04:07 PM
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davesmopars
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And this is why I ask. thanks
Looks like Champion is the choice. I will start with the RC9YC plugs
Last edited by davesmopars; 08/15/18 04:11 PM.
Keeper of the 440 M code Cuda registry mcodecuda@yahoo.com
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Re: What spark plug are you using in your stroked Hemi
[Re: davesmopars]
#2538488
08/19/18 11:54 AM
08/19/18 11:54 AM
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davesmopars
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What do you recommend for a gap.
Keeper of the 440 M code Cuda registry mcodecuda@yahoo.com
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Re: What spark plug are you using in your stroked Hemi
[Re: davesmopars]
#2538528
08/19/18 01:23 PM
08/19/18 01:23 PM
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Posts: 43,007 Bend,OR USA
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What ignition and coil are you using? If a MSD race 7 box with the proper coil set them at .045, if a MSD 6 with a regular coil try .035
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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