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Spark plug cross reference #3107296 01/01/23 06:09 PM 01/01/23 06:09 PM
Joined: May 2004 Posts: 5,123 Warrenton, VA RoadRunnerJD OP master
RoadRunnerJD OP master Joined: May 2004 Posts: 5,123 Warrenton, VA	I am having trouble finding plugs for my 340. Looking for Champion N9Y or equal. It seems N9y’s are no longer available. I get a whole lot of possibilities (even within the same brand) when I try to cross reference them but have no idea what is correct. Any advice on a correct plug will be appreciated.

Re: Spark plug cross reference [Re: RoadRunnerJD] #3107301 01/01/23 06:22 PM 01/01/23 06:22 PM
Joined: Jan 2003 Posts: 20,757 A collage of whims topside Too Many Posts
topside Too Many Posts Joined: Jan 2003 Posts: 20,757 A collage of whims	Looks like they're no longer using the traditional #s. Autozone.com shows the following (all in copper, though platinum & etc are available) : Champion 404 & 415 Autolite 65 NGK 6578

Re: Spark plug cross reference [Re: topside] #3107302 01/01/23 06:30 PM 01/01/23 06:30 PM
Joined: May 2004 Posts: 5,123 Warrenton, VA RoadRunnerJD OP master
RoadRunnerJD OP master Joined: May 2004 Posts: 5,123 Warrenton, VA	Originally Posted by topside Looks like they're no longer using the traditional #s. Autozone.com shows the following (all in copper, though platinum & etc are available) : Champion 404 & 415 Autolite 65 NGK 6578 Thanks for the info but I wonder what plugs are the guys with 340’s actually using?

Re: Spark plug cross reference [Re: RoadRunnerJD] #3107325 01/01/23 07:51 PM 01/01/23 07:51 PM
Joined: Jan 2003 Posts: 4,713 Moved to N.E. Tennessee GomangoCuda master
GomangoCuda master Joined: Jan 2003 Posts: 4,713 Moved to N.E. Tennessee	NGK GR5 In theory, there is no difference between theory and practice. In practice, there is.

Re: Spark plug cross reference [Re: RoadRunnerJD] #3107326 01/01/23 07:55 PM 01/01/23 07:55 PM
Joined: May 2012 Posts: 1,820 South Bend John Brown top fuel
John Brown top fuel Joined: May 2012 Posts: 1,820 South Bend	Champion Copper Plus Spark Plug 415 / RN9YC plugs are available from Amazon. Same heat range, but are resistor plugs to cut radio interference. $12.50 for a pack if four. amazon.com/Champion-Copper-Plus-Spark-RN9YC July 19th should be "Drive Like Rockford Day". R.I.P. Jimmie.

Re: Spark plug cross reference [Re: John Brown] #3107345 01/01/23 09:15 PM 01/01/23 09:15 PM
Joined: Jan 2003 Posts: 20,757 A collage of whims topside Too Many Posts
topside Too Many Posts Joined: Jan 2003 Posts: 20,757 A collage of whims	RRJD - street 340 I used N9Y or N9YC - racecar 340 used C61YC...

Re: Spark plug cross reference [Re: John Brown] #3107350 01/01/23 09:52 PM 01/01/23 09:52 PM
Joined: May 2019 Posts: 6,236 nowhere S Sniper master
Sniper master S Joined: May 2019 Posts: 6,236 nowhere	Originally Posted by John Brown Champion Copper Plus Spark Plug 415 / RN9YC plugs are available from Amazon. Same heat range, but are resistor plugs to cut radio interference. $12.50 for a pack if four. amazon.com/Champion-Copper-Plus-Spark-RN9YC RN9YC are resistor plugs, N9YC are not, the new Champion number is 300 https://www.championautoparts.com/find-my-part/Part-Number-Results.html?part=N9YC https://www.rockauto.com/en/moreinfo.php?pk=317920&jsn=267

Re: Spark plug cross reference [Re: Sniper] #3107374 01/01/23 11:15 PM 01/01/23 11:15 PM
Joined: May 2004 Posts: 5,123 Warrenton, VA RoadRunnerJD OP master
RoadRunnerJD OP master Joined: May 2004 Posts: 5,123 Warrenton, VA	Thanks everyone. I’m going to look for the Champions

Re: Spark plug cross reference [Re: RoadRunnerJD] #3107406 01/02/23 02:34 AM 01/02/23 02:34 AM
Joined: Dec 2005 Posts: 11,550 Fulton County, PA C CMcAllister Mr. Helpful
CMcAllister Mr. Helpful C Joined: Dec 2005 Posts: 11,550 Fulton County, PA	The old numbers are not used in the auto parts now. Except for Autolite and AC. NGK and Champions have part numbers that the counter guy needs to cross to so he can find the plug on the shelf. The minimum wage part timers may not know how to get your RN12YCs that are actually 404s. And the software is based on year, make and model. Asking for a BPR6ES without that information may get the "duh-duh" look. Some of the old plugs, 55-51 Autolites and some on the non resistor numbers are no more. Race plugs are usually what you need for copper non-resistors.. Factory catalogs or websites will be helpful with numbers and what is still available. Have the part numbers when you go to the store. Last edited by CMcAllister; 01/02/23 02:43 AM. If the results don't match the theory, change the theory.

Re: Spark plug cross reference [Re: RoadRunnerJD] #3107407 01/02/23 02:43 AM 01/02/23 02:43 AM
Joined: Aug 2003 Posts: 43,141 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,141 Bend,OR USA	Take a look at the Autolite 3911 and the colder 3910 non resistor race plugs They work well for drag racing up to 7800 RPM, so far Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Spark plug cross reference [Re: RoadRunnerJD] #3107412 01/02/23 05:31 AM 01/02/23 05:31 AM
Joined: Apr 2003 Posts: 1,286 Ft. Lauderdale, FL solarguy pro stock
solarguy pro stock Joined: Apr 2003 Posts: 1,286 Ft. Lauderdale, FL	Thanks for the info but I wonder what plugs are the guys with 340’s actually using? [/quote] Autolite 63 on my 340 runs great

Re: Spark plug cross reference [Re: solarguy] #3107417 01/02/23 07:12 AM 01/02/23 07:12 AM
Joined: Jan 2003 Posts: 13,574 md M mopars4ever I Live Here
mopars4ever I Live Here M Joined: Jan 2003 Posts: 13,574 md	https://www.ebay.com/itm/115659614490 If not I`m pretty sure I have some boxes of old stock 64 autolites and some NOS 3420755 62 p plugs and some mopar N12y plugs.

Re: Spark plug cross reference [Re: mopars4ever] #3107428 01/02/23 08:59 AM 01/02/23 08:59 AM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	if your doing a lot of street driving a n9y is pretty cold. i'd suggest an n11y for street use. i like autolite 3924's for street driving but they're a little warm for highway driving.

Re: Spark plug cross reference [Re: lewtot184] #3107438 01/02/23 09:40 AM 01/02/23 09:40 AM
Joined: Jan 2003 Posts: 10,708 North Dakota 6PakBee I Live Here
6PakBee I Live Here Joined: Jan 2003 Posts: 10,708 North Dakota	Great. First oil, then tranny fluid, then gear oil, now spark plugs. "We live in a time when intelligent people are being silenced so that stupid people won't be offended".

Re: Spark plug cross reference [Re: solarguy] #3107718 01/02/23 03:13 PM 01/02/23 03:13 PM
Joined: Dec 2005 Posts: 11,550 Fulton County, PA C CMcAllister Mr. Helpful
CMcAllister Mr. Helpful C Joined: Dec 2005 Posts: 11,550 Fulton County, PA	Originally Posted by solarguy Thanks for the info but I wonder what plugs are the guys with 340’s actually using? Autolite 63 on my 340 runs great [/quote] 65 is the OE replacement. As the number get smaller, they get colder. We ran 55-51 back in the day. Same plug, nonresistor. Many of these numbers are NA. 63, 64 and 65 are still good. If the results don't match the theory, change the theory.

Re: Spark plug cross reference [Re: CMcAllister] #3107733 01/02/23 04:18 PM 01/02/23 04:18 PM
Joined: May 2019 Posts: 6,236 nowhere S Sniper master
Sniper master S Joined: May 2019 Posts: 6,236 nowhere	Originally Posted by CMcAllister 65 is the OE replacement. As the number get smaller, they get colder. We ran 55-51 back in the day. Same plug, nonresistor. Many of these numbers are NA. 63, 64 and 65 are still good. 51 is now 315 53 is now 300 54 is now 302 55 is now 38 You can punch the old numbers in the link below and it will tell you the new number https://www.championautoparts.com/find-my-part.html

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