Y-blocks had them mounted horizontally.
I think the reason that the myth about vertical mounting got started is because of what will happen if the oil leaks out of the coil. Vertical mount- not much of a mess. Horizontal mount- mucho mess.
dont know where it came from but MSD says it on the install sheet as well as Accell and mallory.
i can only assume a stock coil would be the same.
i was asking b/c i had a few leak on me, wetting the terminal however slightly and causing strange misses that took me a long time to figure out. the oil is so thin you cant see it straight out. I put a Q tip in there and it came out wet. I since went with epoxy and no more issues
The reason is when mounted horizontally the oil will not cover the windings completely causing them to overheat.
I don't think the OEM Ford coil is oil filled. So it can be mounted horizontally.
Oil filled coils have a screw down the high tension terminal, I think that's how they fill it and seal it. You can always tighten that screw after a while and I have stopped some of them from leaking.
The leaking may be a result of the overheating
Larry
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