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Without going in to detail I have a 1985 F250 with 7.5L engine. There is a large no. 1 cast in to the cap near the 2 o'clock distributor terminal on the right side facing from the front of the truck.(2nd terminal down on right side). I don't know if this means No. 1 cylinder or what it is. This is where the No. 1 should be but can anyone confirm this?
It's where #1 should be, but if it's not and the engine is running, do not move it. Ford set the distributor up the same way on all that type of engine. So you can go to the store and the plug wires fit correctly, and you have plenty of movement to set the timing without the vacuum advance hitting anything. But in theory #1 can be anywhere on the cap as long as the wires are in the right order and the distributor is in the correct place.
If you do not know what you are doing, and the engine is running ok, don't mess with it. If you are changing wires, mark them and put them back the way they were.
The No. 1 molded in to the cap on my distributor looks like the picture posted by Max Capacity. I put new plugs and wires on. I ran each wire before pulling the old ones to check reach and marked the number on them. Then pulled and replaced one by one so I don't believe I could have crossed anything.. It ran good but then can feel a slight miss.Correct me if I am wrong but I don't believe you have to mess with the timing when changing plugs or wires.I hope it is not a valve causing the problem.
Make sure you have good spacing between the plug wires. Notice how my firing order puts wires for cylinders 7 & 8 close, make sure they are not touching. I have wire #5 between them in that spacer clip
The firing order is 1-5-4-2-6-3-7-8 Notice 7 and 8 are right after each other in the firing order, and they are next to each other on the engine. There is a tendency to run these wires side by side for neatness, but like Max said, keep these two wires far away from each other or they will crossfire.
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