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75customdart
 Post subject: 75 head ngk plug number
PostPosted: Sun Jul 13, 2008 7:32 am 
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TBI Slant 6
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Joined: Tue Mar 18, 2008 2:50 pm
Posts: 179
Location: Denver Pa
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Need help with the correct ngk spark plug for my 75 dart. What is the best plug and to use in my 75 stock motor? Thanks Cory

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Image75 dart custom, 225, >10.5-1, hurricane, 500holley, erson cam, 904, 8.8 ford 3.55 or 3.91 aussielocked, 17" steelies, and much more.
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Aggressive Ted
 Post subject: NGK Plugs
PostPosted: Sun Jul 13, 2008 8:32 am 
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Supercharged
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Joined: Mon Jan 15, 2007 5:05 pm
Posts: 3767
Location: Black Diamond, WA
Car Model:
ZFR5N for the old head, UR4 for the peanut plug heads.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG
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65Dodge100
 Post subject:
PostPosted: Sun Jul 13, 2008 8:36 am 
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Turbo Slant 6

Joined: Sat Dec 08, 2007 9:48 pm
Posts: 570
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See this thread

Danny
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Wesola78
 Post subject:
PostPosted: Sun Jul 13, 2008 11:58 am 
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Turbo EFI
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Joined: Mon Nov 04, 2002 9:07 am
Posts: 1192
Location: Cypress, Texas, Northwest Houston. The Lone Star State
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'75 and later: UR4 or 6630 NGK.

I use 'em in my '78 Volare's 225.

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'78 Volare 225
'67 Charger 318
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DusterIdiot
PostPosted: Sun Jul 13, 2008 12:00 pm 
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Joined: Tue Oct 29, 2002 8:27 pm
Posts: 9714
Location: Salem, OR
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Either UR-4 or UR-5 will work depending on the need for a cooler or hotter plug (depending on condition of engine, carburation, timing, climate, etc...)

-D.Idiot
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Wesola78
 Post subject:
PostPosted: Sun Jul 13, 2008 12:30 pm 
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Turbo EFI
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Joined: Mon Nov 04, 2002 9:07 am
Posts: 1192
Location: Cypress, Texas, Northwest Houston. The Lone Star State
Car Model:
Hey D.I., which plug is hotter, and which one is colder?
Thanks,
Wes

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"Ja, Ich fahre ein altes auto."
'78 Volare 225
'67 Charger 318
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DusterIdiot
 Post subject: Less is hotter...
PostPosted: Sun Jul 13, 2008 1:26 pm 
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Joined: Tue Oct 29, 2002 8:27 pm
Posts: 9714
Location: Salem, OR
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On NGK's site they have a decoder sheet, 2 being the 'hottest' and 11 begin the coldest... so a UR-5 is colder than the UR-4...

-D.Idiot
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