Just finished installing them in my 98 Mark (85k miles). They are double platinum, and one step colder than the Autolite 764's that most everyone uses. I set the gap at .048. Why .048? Well, it is a good number to use for the 764's $4.00 per plug at NAPA. 5 year unlimited miles, limited guarantee. In my test run, at WOT, it felt like it pulled much harder than with the old plugs. I am going to reset the mileage computer to see if there is a change. On average, city/hwy, I am at 21.8 mpg.
I do not think anyone has posted anything about these plugs on this site, so, thought I would get one started, and see if anyone has a opinion. The Motorcraft's that were in there looked to be the original plugs. The last plug, on either side, closest to the firewall, had signs of rust on the boots, and plugs. I believe water enters through the cutout where the coil harness fits on the cover, and ends up going into the end plug hole.
I also purchased every coil pack boot (p/n F7LZ-12A402-AA) between Kennesaw, and Marietta, GA. (two Ford, and two L/M dealers) They are about $8.00 a piece, and felt that it is a good idea to just replace them all during the plug change, before they start to arc while I am in the middle of the sticks somewhere. All the old boots looked great, including the two rusty looking ones. I have a good supply of spares now.
That is all for today. Tomorrow, I am going to install a new serpentine belt, ceramix pads up front, and speed bleeders on all four calipers so I can (one person) flush the old brake fluid, and refill with fresh Valvoline synthetic brake fluid (exceeds dot 4 )
I do not think anyone has posted anything about these plugs on this site, so, thought I would get one started, and see if anyone has a opinion. The Motorcraft's that were in there looked to be the original plugs. The last plug, on either side, closest to the firewall, had signs of rust on the boots, and plugs. I believe water enters through the cutout where the coil harness fits on the cover, and ends up going into the end plug hole.
I also purchased every coil pack boot (p/n F7LZ-12A402-AA) between Kennesaw, and Marietta, GA. (two Ford, and two L/M dealers) They are about $8.00 a piece, and felt that it is a good idea to just replace them all during the plug change, before they start to arc while I am in the middle of the sticks somewhere. All the old boots looked great, including the two rusty looking ones. I have a good supply of spares now.
That is all for today. Tomorrow, I am going to install a new serpentine belt, ceramix pads up front, and speed bleeders on all four calipers so I can (one person) flush the old brake fluid, and refill with fresh Valvoline synthetic brake fluid (exceeds dot 4 )