Thread: New to me 4.7
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Old 07-29-2013, 06:38 PM
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snrusnak snrusnak is offline
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The plugs on the lower bank(exhaust side of the cylinder head) are yttrium enhanced iridium. Basically, iridium, yes. The upper bank(intake side of the cylinder head) are yttrium enhanced copper. Basically copper. The yttrium essentially just provides longer life.

You can interchange them, the only benefit of the iridium will be longer life. I would recommend changing the intakes every 50k miles though because the coil boots end up getting seized to the plugs if you don't service them a little more often. And be sure to apply dialectric grease or you'll fight them next time too.

After ripping the boots, use a piece of copper plumbing(I think 1/2" is what it was), abuot 8" long, and push it between the boot and plug. This will break the seal.

Also, do the intake side plugs one at a time. The bolts that hold the coils also hold the intake manifold. Don't want to loosen them all at once.
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