When I got my 62 225 it came with an extra set of Champion RN14YC plugs. I was going to use them but after reading an excellent article here, Autolight 925 plugs were recommended without gaskets. It's probably a less than perfect question but are plugs all that different on a stock motor and what is the issue with gaskets? I'm going to assume that it's to put the plug further into the center of the combustion chamber.
Thanks.
Joe

You can use the RN14YC plugs, but Champion plug quality has been variably bad over the years and the extended-nose plugs work better. Autolite plugs are now made poorly in China; use NGK ZFR5N instead. '60-'62 heads do use the metal ring washers ("gaskets") on the spark plugs, while '63-'74 heads do not. Tune-up parts and technique suggestions, including a link to the spark plug gasket information, can be found in this thread.

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Too many people who were born on third base actually believe they've hit a triple.

Thanks Dan. As always your advice/information is greatly appreciated. I've already gotten the new tube seals and thought I should check before digging in. Glad I did.
Thanks.
Joe
Dan, I'm sending you a PM about a small issue I've got.

PM received, plz stand by for response.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Dan, are you sure of the NGK ZFR5N plugs?? NAPA looked at me like I was nuts. OK, they always look at me that way but they couldn't cross the number.
Thanks.
Joe
That last PM I sent you, the issue has been settled.

Yes, ZFR5N is a good number. NGK uses 2 different numbers, a stock number and a part number. The stock # for ZFR5N is 3459, you may want to try giving your parts store that.

Excellent. Pierre thank you. I'll have to have a talk with my NAPA guys.
Joe

Joe, did you talk to them on the phone about those plugs? Cause I picked some up today and when I called the guy first said he couldn't find that number, but it turns out he thought I was saying the last part number was a M and not the N it should be, after we cleared that up he found them and I went and picked them up.

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06 Dakota Quad Cab 4.7 HO
Airaid Intake, 50 Series FlowMaster Muffler.
Fastman 68.5 TB
Bed Extender
03 Neon SE
AEM Cold Air Intake, 80 Series FlowMaster Daul Outlet Muffler
1974 Duster w/318 (needs lots of TLC)
1974 Duster W/225

Ask for a plug for a '90's Jeep with the 4L 6cyl engine. Should list the ZFR5N plug for them.

Thanks guys, Again a lot of information. I had talked to the guy with my little piece of paper in my hand with part numbers on it. To be fair, I sometimes can't read my own hand writing and I do tend to mumble. But, these guys are used to me. It's a small town and when you visit them often enough, like once a week, and always ask for weird stuff, like Valiant stuff, they tend to remember you. They always have tried hard to come up with something that will work.
Thanks again
Joe

To throw another wrench into the discussion here: has anyone yet found a good extended nose plug for '75-up (no drool tube) heads? I know some have been researching it, and I searched with no results but was curious if maybe I just missed something. I've been using the OEM spec NGK plugs since I got my Duster a couple years ago.

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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me

popcorn

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

...sounds mighty tasty right about now

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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me

hello,
is there any visual method of identifying an early head that needs the spark plug washers left on? I have read as much about the removal of washers on 63 - 74 heads,bvut I have never seen mentioned how you tell the difference. just the early ones 60 -63. I have no way of knowing what the head on my engine is date wise,just that it is a drool tube type.
Someone with a pic perhaps,or point me to an old post.My searches have not really answered that question.
Engine is a 225, BTW. using ZFR5N plug.ATM,the washers are still on.
I know,I am naughty,but I want to be sure of the plug seat type.

the car is a 67 Aussie Valiant,but has had at least 2 engine changes that I know of.

regards ,Rod