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300 hr Spark plug change

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16 of the Motorcraft CYFS-12FP spark plugs at 0.044 inch gap should do the trick.  Be careful when removing the upper on-plug coils to avoid damaging the boots.  The original set of upper plugs were different than the lower plugs, but according to Indmar the replacement spark plugs are all the same.

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7 hours ago, oldjeep said:

Those motor craft plugs are under $4 at rock auto.  Not too bad for iridiums

need to check that next time, my 5.7’s were $11 at auto zone!

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On 7/14/2021 at 5:38 PM, granddaddy55 said:

need to check that next time, my 5.7’s were $11 at auto zone!

Beats the $14 each my dealer wants for  the Autolite XP5363 if that is even the right plug?  Bakes is showing the Motorcraft CYFS-12FP @ $9.99 ea. Ebay can do 16 for $72.25

Thanks again for your help guys.

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Yep headed there now. Get packages regularly from them anyway. Mainly wanted to be sure I had the right part #.

1 minute ago, hunter77ah said:

Check out rock auto. They have been by far the cheapest I have found. 


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  • 1 month later...

Ended up buying from eBay same price as Rock Auto. Under $80 total for 16 CYFS-12FP plugs. Install was not that bad but definitely takes some time. 

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