F Head Spark Plugs

I'm having a mech do some work to my 60 CJ5. I'm out of town, so I'm going by what the guy is telling me over the phone. It goes like this:

I asked him to put new plugs in it. From several posts here, I understand that while the FSM recommends a J8 plug. However, the current J8 is about 1/8" "shorter" than it should be. The Champion L86C was a recommended replacement.

So, I have the guy get the Champion L86C and install. He tells me that when it runs, he can hear gasses escaping through the plug bores - with the plugs securely installed.

Did I spec the wrong plugs ? Or, do I have highly worn threads in the plug bores? If it's leaking gas, I assume that it will erode the bores.

Any input from y'all will be much appreciated.

 

did he use the gaskets ?many new style plugs use a tapered seat,if he is young he might not know of the gaskets

 

Glenn - appreciate the info.

Dos - I don't know, but I'll check with him. I guess there's a good reason they supplied them with the plugs.

Thanks for the input, gents.

Trying to keep forward motion on the jeep project by long distance may not be the smartest move I've made. Really want to have it on the road by spring.

 

I just called advanced auto looking for champion l86c plugs, and they said they didn't have any, but the Autolite 425 crossreferenced to this. They also said there isn't an Autolite 295. Did they change the part numbers again?

 

wow I'm glad I didn't go pick them up! COMPLETELY different plug!

 

295 is still a good autolite number just sold some last week

 

Yeah I searched on advanced auto's website and it said they had some in stock at that location.... don't know what the parts girl was doing? I'm gonna pick some up today and hopefully I can get the Jeep started

 

Finally got home and checked in on the CJ. dos equis, you called it. The young mech left out the "gaskets" - it's running like a champ now. Once again, appreciate all the helpful advice. Don't know what I'd do without this site - essential if you're not a gearhead. Y'all have a great Xmas and New Year!

 

I think its pretty easy to leave those out if you aren't paying attention. I just replaced mine and went throught the boxes afterwards based on this thread, and wouldn't ya know, I had a gasket in one of the boxes. Oops!