What heat range plugs?
#3220526
03/14/24 11:41 PM
03/14/24 11:41 PM
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Joined: Feb 2008
Posts: 46 Medford, OR
carrman
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OP
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Joined: Feb 2008
Posts: 46
Medford, OR
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I've got a 440 with Stealth heads. Compression is about 8.2:1 as it's a late '72 engine form an RV, but does have a forged crank. I running a Lunati roller cam with these specs:
Advertised Intake Duration: 270 Advertised Exhaust Duration: 278 Intake Duration at .050 Inch Lift: 219 Exhaust Duration at .050 Inch Lift: 227 Intake Valve Lift: 0.515 Exhaust Valve Lift: 0.530 Lobe Separation: 110 Intake Center line: 116
Running an FBO electronic ignition with one of their custom curved distributors tailored to this cam. My question is this, what heat range plugs should I be running? I use NGK and prefer to stick to these. The car is a heavy Newport convertible I use as a cruiser and freeway runner. Any suggestions?
Last edited by carrman; 03/14/24 11:43 PM.
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Re: What heat range plugs?
[Re: carrman]
#3220745
03/16/24 01:57 AM
03/16/24 01:57 AM
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Joined: Aug 2003
Posts: 43,243 Bend,OR USA
Cab_Burge
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I Win
Joined: Aug 2003
Posts: 43,243
Bend,OR USA
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Do you have a picture of one, hopefully #7? Autolite # 3924 should be a 3/4 reach plug with a 5/8 socket size, not correct for stock iron heads I am breaking a pump gas iron headed motor now for a local customer, I put a set of Champion RJ86Y in it I was hoping to find some Champion RJ12YC or maybe even some RJ14YC or RJ10YC but no hope in my current stock
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What heat range plugs?
[Re: carrman]
#3220882
03/16/24 06:46 PM
03/16/24 06:46 PM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
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master
Joined: Feb 2003
Posts: 2,810
Sobieski Wi
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With that low of compression 8.2-1
NGK 7938 - BKR5E
Last edited by bee1971; 03/16/24 06:48 PM.
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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Re: What heat range plugs?
[Re: carrman]
#3221165
03/18/24 02:08 AM
03/18/24 02:08 AM
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Joined: Aug 2003
Posts: 43,243 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,243
Bend,OR USA
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Do you know how cold the # 11 are ? Probably work great in a high compression blown or turbo charged motor with 12+ lbs. of boost on gasoline
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What heat range plugs?
[Re: carrman]
#3221343
03/19/24 02:59 AM
03/19/24 02:59 AM
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Joined: Aug 2003
Posts: 43,243 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,243
Bend,OR USA
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BKR6E-11 Are what I have in there now, they are one heat range colder than the ones I want to put in.
Dave Is the 6# or the 11# the heat range on hose plugs. I don't use NGK, Autolites or Champions for me
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What heat range plugs?
[Re: Cab_Burge]
#3221379
03/19/24 10:11 AM
03/19/24 10:11 AM
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Joined: Dec 2004
Posts: 149 Albert Lea, MN
GTX5877
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member
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Posts: 149
Albert Lea, MN
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The #6 is the heat range and the 11 is the gap. #5 would be one step hotter
1967 Dart GTS 426 Gen III Hemi 1968 Hemi Cuda 572 SS/AH Clone 1988 Chrysler LeBaron Coupe S/S 2003 Dodge Ram 1500 4dr SLT lowered 2012 Ram 1500 2wd Lowered 1970-1/2 Camaro Z-28 1974 VW Karman-Ghia
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