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Author Topic: Spark Plug Help  (Read 228 times)
ODZKing
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« on: June 18, 2017, 02:31:21 PM »

Back when we did the 73 engine, in checking on plugs for the 400 4bbl, I came up with the original # of J11Y. I crossed it (then) to RJ14YC.  I am about to get a set and to my surprise, what is recommended RJ12YC which is the same plugs as my 67 - 383 4bbl.
http://www.sparkplug-crossreference.com/convert/CHAMP_PN/J11Y
So researching as I do, I realized the RJ14 is a bit longer. Not being a genius when it comes to this I have to question ... what is the difference between the two lengths and have I been using the WRONG plugs in my 73 400 4bbl all this time?Huh  shruggy

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firefighter3931
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« Reply #1 on: June 19, 2017, 06:07:45 AM »

Just run an NGK "XR5" plug and gap it at .035.....your motor will luv it !  yesnod



Ron
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68 Charger R/T "Black Pig" Street/Strip bruiser, 70 Charger R/T 440-6bbl Cruiser. Firecore ignition  authorized dealer ; contact me with your needs
Nacho-RT74
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« Reply #2 on: June 19, 2017, 06:10:01 AM »

Now I saw it LOL!

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Venezuelan RT 74 400 4bbl, 727, 8.75 3.23 open. Now stroked with 440 crank and 3.55 SG. Here is the History and how is actually: http://www.dodgecharger.com/forum/index.php/topic,7603.0/all.html
http://www.dodgecharger.com/forum/index.php/topic,25060.0.html
ODZKing
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« Reply #3 on: June 19, 2017, 08:36:45 AM »

So if I go with NGK's, 400 = XR5.
How about 383 4 bbl also, which NGK for that engine?
In looking at Rock Auto, they recommend XR4's for the 383. 
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c00nhunterjoe
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« Reply #4 on: June 19, 2017, 05:11:28 PM »

So if I go with NGK's, 400 = XR5.
How about 383 4 bbl also, which NGK for that engine?
In looking at Rock Auto, they recommend XR4's for the 383. 

Depends on the cam, compression and heads. Odds are you will end up with the xr5
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ODZKing
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« Reply #5 on: June 19, 2017, 06:31:20 PM »

Depends on the cam, compression and heads. Odds are you will end up with the xr5
All stock with A LOT of miles on the old girl.  Roll Eyes
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firefighter3931
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« Reply #6 on: June 20, 2017, 06:07:46 AM »

The XR5's are a great all around plug for iron head builds that run between 8.5-10.0 compression. More compression requires a colder plug while less compression needs a warmer plug.

ODZ ; I'd run the XR5's in both of those cars



Ron
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68 Charger R/T "Black Pig" Street/Strip bruiser, 70 Charger R/T 440-6bbl Cruiser. Firecore ignition  authorized dealer ; contact me with your needs
ODZKing
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« Reply #7 on: June 20, 2017, 11:43:20 AM »

Thanks folks. I ordered 16 NGKs from Rock Auto.  Great price I thought, $1.39 each and same shipping 8 or 16 so I ordered 2 sets. Came to $28 to me. Cheaper that could get them locally.  2thumbs
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ACUDANUT
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« Reply #8 on: June 20, 2017, 03:34:29 PM »

Just run an NGK "XR5" plug and gap it at .035.....your motor will luv it !  yesnod



Ron

Great Spark plug.  cheers
Too bad it's made in Japan. brickwall
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69wannabe
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« Reply #9 on: June 20, 2017, 08:44:43 PM »

You will be happy with the NGK's!! Like Ron said the XR5's are all around good plugs for any cast iron big block with less than 10 to 1 compression. I ran the #6 heat range NGK's in my 493 before I swapped to the stealth heads and they ran great. I am running the longer reach #6 NGK's in the stealth heads and they seem to be the perfect selection. Ron recommended the NGK's to me when I went to the firecore dizzy and wire set and they worked out great. I was always a champion guy until I tried the NGK's.......
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