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.

 

[MWbirdLOVER70]

Contact Frank Badelson/Rodger Gibson Restorations for reproduction spark plug wires

 

[Don Frelier]

I guess I'm the exception.
I've seen several Autolite plugs bad right out the box.
I'd never buy/install them.

 

[dadsbee]

 

[Mopar Miki]

Don't be cheap about the spark plug wires - firecore spark plug wires, there is nothing better. None.

As for plugs many are stuck mentally in the 70's just like with operating temps, alignment specs and shocks. Today's fuel requires 195 F so get over it
From too many years of experience i find J11's are too cold. I run j14's in my current playtoy which gets run very hard and put away wet.