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Stealth spark plugs #1278324
08/02/12 04:13 PM 08/02/12 04:13 PM
Joined: Jul 2012
Posts: 21
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skelator Offline OP
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skelator  Offline OP
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Hey guys I wanna pick up some new plugs for my 440 with stealth heads. What do you guys recommend?
Re: Stealth spark plugs [Re: skelator] #1278325
08/02/12 04:34 PM 08/02/12 04:34 PM
Joined: Aug 2003
Posts: 43,269
Bend,OR USA
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Cab_Burge Offline
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Quote:

Hey guys I wanna pick up some new plugs for my 440 with stealth heads. What do you guys recommend?

What size motor, mechanical (calculated)compression ratio, fuel type and intended use?

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Stealth spark plugs [Re: Cab_Burge] #1278326
08/03/12 08:48 AM 08/03/12 08:48 AM
Joined: Jan 2003
Posts: 21,081
Niles , Ohio
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therocks Offline
oh wait.but hey.lets see.oh yeah.
therocks  Offline
oh wait.but hey.lets see.oh yeah.
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Niles , Ohio
My 440 with 12.5 domes I run NGK R5671A-8s.I ran Autolites and went to NGKs 3 years ago.Still has the same set in.Its street driven and very happy with the NGKs.The Autolites seemed to have a slight miss after some miles.Rocky

Chrysler Firepower
Re: Stealth spark plugs [Re: therocks] #1278327
08/03/12 09:51 AM 08/03/12 09:51 AM
Joined: Jan 2007
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ahy Offline
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I have used NKG's based on Mancini's chart by compression ration for aluminum heads. No problems.

http://chucker54.stores.yahoo.net/ngkplugs.html
Re: Stealth spark plugs [Re: ahy] #1278328
08/03/12 11:22 AM 08/03/12 11:22 AM
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skelator Offline OP
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Not sure on the exact compression but I have stealth heads, flat top pistons with valve reliefs at zero deck. I think the head gaskets were .040 they were just felpros id have to look them up to be sure
Re: Stealth spark plugs [Re: skelator] #1278329
08/03/12 09:05 PM 08/03/12 09:05 PM
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ahy Offline
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Sounds like 10:1 or a bit more. I'd pick plugs based on 10:1.
Re: Stealth spark plugs [Re: skelator] #1278330
08/04/12 01:35 AM 08/04/12 01:35 AM
Joined: Aug 2003
Posts: 43,269
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Quote:

Not sure on the exact compression but I have stealth heads, flat top pistons with valve reliefs at zero deck. I think the head gaskets were .040 they were just felpros id have to look them up to be sure

Try RC9YC or Autolite AR3911 or 3923 or 3933

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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