440 U-Code Spark Plugs & Wires

[RT70]

Can you Mopar Experts give me some advice on what kind of Spark Plugs and Spark Plug Wires to use on my car. It is a 1970 Dodge Coronet R/T with a 440 U-Code, 727 Auto, and Dana-60 Rear. The car is still stock. The 1970 Dodge Service Manual for the Coronet recommends Champion J11Y or Mopar P-34P. Should I just get the J11Y off EBAY or is there a good after market Spark Plug? Also, any advice on a good set of Spark Plug Wires? I'm not a mechanic but can do minor maintenance. Thanks

 

[WileE]

If you're keeping the "original stock" look, then those plugs are the answer. You can get a set of date-coded (black) wires as well. If not... let the opinions begin...

 

[Jerry Hall]

I use Autolite 85's in my 70 440 4bbl Superbird with good results. Ofcourse I've never been able to get a Champion plug to last long in any of my Mopars. My engine is stock with the exception of a 440-6 cam.

 

[70 SUPERBIRD]

I use Autolite 85's in my 70 440 4bbl Superbird with good results. Ofcourse I've never been able to get a Champion plug to last long in any of my Mopars. My engine is stock with the exception of a 440-6 cam.

I use the same plugs. Never had any problems with them

 

[RT70]

If you're keeping the "original stock" look, then those plugs are the answer. You can get a set of date-coded (black) wires as well. If not... let the opinions begin...

Thanks

 

[RT70]

Thanks

I use Autolite 85's in my 70 440 4bbl Superbird with good results. Ofcourse I've never been able to get a Champion plug to last long in any of my Mopars. My engine is stock with the exception of a 440-6 cam.

Thanks

 

[RT70]

I use the same plugs. Never had any problems with them

thanks

 

[lewtot184]

J11y is the better plug but haven't been manufactured in decades. I use autolite 85's as a substitute. OEM wires would have been 7mm carbon core; farly high resistance. J11y plugs were non- resistor, 85's are resistor. OEM wire plus the 85 plug will have more resistance than original. It may be debatable as to the pro's and con's to this but i try to stay under the service manuals 9000 ohms resistance per cylinder.