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75 head ngk plug number
https://slantsix.org/forum/viewtopic.php?t=29982
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Author:  75customdart [ Sun Jul 13, 2008 7:32 am ]
Post subject:  75 head ngk plug number

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

Author:  Aggressive Ted [ Sun Jul 13, 2008 8:32 am ]
Post subject:  NGK Plugs

ZFR5N for the old head, UR4 for the peanut plug heads.

Author:  65Dodge100 [ Sun Jul 13, 2008 8:36 am ]
Post subject: 

See this thread

Danny

Author:  Wesola78 [ Sun Jul 13, 2008 11:58 am ]
Post subject: 

'75 and later: UR4 or 6630 NGK.

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

Author:  DusterIdiot [ Sun Jul 13, 2008 12:00 pm ]
Post subject:  Depends on the condition and carburation...

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

Author:  Wesola78 [ Sun Jul 13, 2008 12:30 pm ]
Post subject: 

Hey D.I., which plug is hotter, and which one is colder?
Thanks,
Wes

Author:  DusterIdiot [ Sun Jul 13, 2008 1:26 pm ]
Post subject:  Less is hotter...

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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