Slant Six Forum :: Spark Plugs for Slant Six?

There are a lot of threads on spark plugs.

There are two head designs you need to be aware of. The spark plug tube head, and the peanut plug head.

The two different heads use very different spark plugs.

If you have the spark plug tube head and your engine is stock or mild, my favorite NGK plug is the ZFR5N. This is an extended reach plug that performs very well at standard or improved compression builds that don't get over 9.5:1. For higher compression the ZFR6FIX-11 works well. Currently I have Autolite XP5224's installed in my 10.7:1 compression engine. (A direct cross over for the ZFR6FIX-11.)
With Iridium plugs: Do not attempt to gap them! Leave them alone as the material is extremely hard and will flake off if you put a gap tool in there.

Now, if you have a peanut plug head, you'll need to get more agressive with the search engine, 'cause I don't know.

CJ

Author:	1966DartConvertible [ Sun Jan 30, 2011 8:43 am ]
Post subject:	Spark Plugs for Slant Six?
Hi, ive checked the FAQ and cant find any thread on spark plugs... So here goes...Whats the best spark plug to use on the Slant Six? I would prefer if you could tell me in terms of "NGK equivalent" as it is almost impossible to find Champions or the likes this side of the Atlantic. Im thinking either BP5ES or BP6ES? Are they any good? Oh more importantly, will they FIT? Thanks. Syed Malaysia

Author:	acemang [ Sun Jan 30, 2011 8:57 am ]
Post subject:
The Bp5es will work. If you can get them of course go champion, but as you said they may be a bit difficult for you to get. NGK is more designed for asian motors, but they will work.

Author:	krytellan [ Sun Jan 30, 2011 8:59 am ]
Post subject:
It would depend on the year of your engine. I just had this question myself and would refer you to this thread. http://www.slantsix.org/forum/viewtopic.php?t=43273

Author:	ceej [ Sun Jan 30, 2011 9:07 am ]
Post subject:
There are a lot of threads on spark plugs. There are two head designs you need to be aware of. The spark plug tube head, and the peanut plug head. The two different heads use very different spark plugs. If you have the spark plug tube head and your engine is stock or mild, my favorite NGK plug is the ZFR5N. This is an extended reach plug that performs very well at standard or improved compression builds that don't get over 9.5:1. For higher compression the ZFR6FIX-11 works well. Currently I have Autolite XP5224's installed in my 10.7:1 compression engine. (A direct cross over for the ZFR6FIX-11.) With Iridium plugs: Do not attempt to gap them! Leave them alone as the material is extremely hard and will flake off if you put a gap tool in there. Now, if you have a peanut plug head, you'll need to get more agressive with the search engine, 'cause I don't know. CJ

Author:	DusterIdiot [ Sun Jan 30, 2011 9:11 am ]
Post subject:	Simple...
Quote: Now, if you have a peanut plug head, you'll need to get more agressive with the search engine, 'cause I don't know NGK-UR5 standard...you can go up or down one in heat range if needed as only UR-4 and 6's are available... -D.Idiot

Slant Six Forum https://www.slantsix.org/forum/

Spark Plugs for Slant Six? https://www.slantsix.org/forum/viewtopic.php?t=43438	Page 1 of 2

Author:	Aggressive Ted [ Sun Jan 30, 2011 9:19 am ]
Post subject:
On the peanut plug head I run NGK UR4GP/#2869 spark plugs re-gaped plugs from .035 to .040.

Author:	Charrlie_S [ Sun Jan 30, 2011 9:22 am ]
Post subject:
Quote: The Bp5es will work. If you can get them of course go champion, but as you said they may be a bit difficult for you to get. NGK is more designed for asian motors, but they will work. I totally don't agree. I will not put a Champion in a lawnmower, much less a car. I use NGK's in all my engines, with very good results. This is my opinion, others will have theirs

Author:	ceej [ Sun Jan 30, 2011 9:29 am ]
Post subject:
Quote: So I guess mine is a tube head eh? It is if that's what's bolted to the top of the block. Many convert to the peanut to decrease leak problems, so one would be guessing in this instance. CJ

Author:	wjajr [ Sun Jan 30, 2011 9:32 am ]
Post subject:
A few weeks ago I replaced the plugs in the wifeâ€™s 2007, 3.7L Nytro. Chrysler factory installed plug was NKGâ€™s, in this non Asian engine. Currently Iâ€™m running Autolite sparkplugs in the slant six: â€œAP 26â€ in 1 & 6 cylinders; and â€œAP 25â€ in 2, 3, 4, and 5 cylinders. Bill

Author:	ceej [ Sun Jan 30, 2011 9:57 am ]
Post subject:
Why the hotter plugs in 1 and 6 Bill? CJ

Author:	Charrlie_S [ Sun Jan 30, 2011 11:13 am ]
Post subject:

Author:	walpolla [ Sun Jan 30, 2011 1:08 pm ]
Post subject:	Re: Spark Plugs for Slant Six?
Quote: Hi, ive checked the FAQ and cant find any thread on spark plugs... A use of the SEARCH function will reveal a much different story. One THOUSAND ,six hundred and eight hits, to be precise. Just type in the words "spark plugs". regards,Rod

Author:	wjajr [ Sun Jan 30, 2011 1:09 pm ]
Post subject:
Ceej: Quote: Why the hotter plugs in 1 and 6 Bill? I read some where, here or other place canâ€™t remember, it was before I kept notes on such things, that running hotter in 1 & 6 corrected for fuel distribution difference. All six of my plugs exhibit same color, so something is close to being right. Canâ€™t tell if it is because of the plugs, or all six are getting a good fuel mix, or a little of bothâ€¦ Beats me. Hey, thatâ€™s my story, and Iâ€™m sticking to it. LOL Perhaps if a cam swap were to take place, I may use all the same heat plug just to see if there is a NKG'en deference. Charrlie S: Quote: At one time I would use Autolites, but not anymore. Read the box, most made in China. I spect they are, gotâ€™em at Wal-Mart in blister packs! Bill

Author:	speedy [ Sun Jan 30, 2011 3:59 pm ]
Post subject:
http://www.sparkplugs.com Cross reference any plug.... any vehicle

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