NGK plugs.

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4 is quite a hot plug in the NGK range, I would try them if the price is good. Factory rated they they were a 5 or 6 heat range.
I use 4s in my 455 Pontiac, & have them in a friend's 455 that will get drag raced; sizable cam in that engine & it noticeably improved the idle quality.
In my opinion, many engines have plugs that are too cold..... They they then foul up at idle.
 
There are supposedly fake NGK plugs on the net. There is a way to tell the fake from the genuine plugs, it is on the net somewhere.
 
NGK has a Productfinder application on their website.
NGK has a excellent freeburn. No need for hot plugs.
 
Bewy said:
4 is quite a hot plug in the NGK range, I would try them if the price is good. Factory rated they they were a 5 or 6 heat range.
I use 4s in my 455 Pontiac, & have them in a friend's 455 that will get drag raced; sizable cam in that engine & it noticeably improved the idle quality.
In my opinion, many engines have plugs that are too cold..... They they then foul up at idle.
Click to expand...

its what was in my 360. that number seems to cross reference with a autilite 65 which i had run in many small blocks. at 11 bucks and free shipping i bought them.

as far as them being fake, i don't know. when the lady called to ask a question about the order the place sounded legit. guess i'll find out.. :)
 
i have two sets on the way.

i ordered one set the night i found them. then after thinking about it i ordered another set the following morning. the lady called me to make sure i wanted two sets and didn't mess up. i told her yes send both sets (16). always like have a set of plugs on the shelf.
 
Maybe marine buys more so they get them cheaper? Or winter sale just to move them along.
If they are genuine plugs those are very inexpensive. Boat people don’t mess around…. When on the water- you cannot walk home if you break down. I know I’ve bought “genuine Johnson” out board coils before. One went out 20mins out. Lucky I made it home on one cylinder. They were fakes- eBay. I bought 2 from the dealer and never had an issue. Thanks for the letting us know about these.
 
Of course, it could be that the fake product is actually better made than the real product. Probably unlikely...but possible.
 
I have a bunch or 64 autolites I will sell cheap. Equal too RN11y I believe. I used them in my 360

autolite.jpg
 
Champion RC12YC's in the avatar. Note the center electrode appears to be missing. Nope - it's there, just pushed up inside. I got these back to Champion and had their tech specialist have a look at them. He explained that today's plugs have a test they have to pass that this ancient design does not. Gas pressure pushes the center electrode up and breaks the seal. This obviously way opens up the gap as well as allowing the gasses to escape between the metal housing and the ceramic. As for the seal?? It's actually compressed talcum powder!!

I caught this at the track when my mph seemed to be off a couple. Pulled the plugs and 2 of them were "surprise, surprise, surprise!" It's now got Autolote AP3924's and seems just fine with those.

I learned something for sure!!
20221009_191930.jpg


20221009_191917.jpg
 
After seeing the pics in post #16: Why would you use Champion plugs? Not if you want to be the champion....
 
Champion does make a newer plug that wouldn't have that failure mode. The guy gave me the p/n but they were like $11-$12 apiece and I figured I could do just as well for 1/2 the price. Hence the Autolites in it now!
 
I have never heard of a plug having that failure mode, the electrode getting forced into the insulator. Shouldn't happen.......no matter the price.
 
That was the point and reason I posted. This is a failure mode that plug manufacturers have designed out with their newer designs. They have a test that they must pass to look for this failure mode.

While we all love some of the things we use (or used to use), and mostly without issues, the newer stuff truly does have some advantages.
 
Rabbit hole:
Oil filters- most newer have gone cheap.
Some got better with technology. Perfect example is Fram. PH8A- now junk. NAPA gold 1515- same filter but so much better internally. I get the idea about spark plugs but why would manufactures put in a “fail safe?” Unless the piston hits the plug, what’s the point?
Syleng1
 
Can you post some photos of them? I'm curious if they're genuine or counterfeit. If they are, that was a nice deal!
 
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