Are thease the rite plugs for a 98 4.6?

 

I know that this doesn't 100% answer your question, but I have regular copper autolite 764's in my '98 4.6. I think I have about 5,000 miles on those plugs.

 

Yes thats the right # for a Autolite single platinum in a 4.6.
Basically it's 764 for the standard copper core, AP764 for single plat's, and APP764 for double plats.

 

I thought the double plats were required aftermarket cause the plugs fire electrode to ground on 4 and ground to electrode on the other 4. Isn't that why the manual says when removing plugs if you put the old plugs back you gotta keep em in the same cylinder? and there are two different plug numbers used.

Clarification please KY

 

For the 4.6L, you are correct. Use double plats or 4 of your plugs will still be worn out in 12k miles. From the factory, Ford supplies two different single platinum plugs, one that has a platinum electrode and the other a platinum ground. For service, Ford recommends replacing them all with double plats.

 

APT is pretty much dead on with what he was saying. For the longest life and best performance you should use a double platinum plug. You can use a single platinum or even a standard copper plug and the truck will still run fine. I would think they should go more than 12K, I would say 20-40K would be more like the max life out of a copper or single platinum in our trucks.

 

Anyone here try the irridium plugs they have out. How well would that work on the 4.6.

I'm considering using them on my 2001 supercrew.

opinions?

skip

 

I replaced my factory plugs with NGK Iridium last Fall. What can I say, they work fine so far. Nothing good, or bad that I can tell, but I only have about 8k miles on them. However, I believe they still have a nickle ground so I would not use them in a 4.6L without making sure. No sense using a $9 plug if it isn't any better than a $0.99 one.