I installed a Pertonix II module and a Flamethrower coil 15 years ago, and I mounted the coil in the stock location (front of the Passenger Side cylinder head) and it's still going strong.
I would mount it in the stock location and not worry about it.

Michael H. wrote:

I installed a Pertonix II module and a Flamethrower coil 15 years ago, and I mounted the coil in the stock location (front of the Passenger Side cylinder head) and it's still going strong.
I would mount it in the stock location and not worry about it.

This is great to hear! Thanks for sharing. I will stick with the original location then.
 

I don't know Gaba... that sounds like a slippery slope toward moving to an engine with the distributor in the back

Interesting.  Whenever I see those inner fender mounted coils I've often wondered if there were any issues due to the long coil wire.

Michael H. wrote:

Interesting.  Whenever I see those inner fender mounted coils I've often wondered if there were any issues due to the long coil wire.

As you MAY know I have  all my wiring hidden in my engine compartment.....including the coil.
I installed it in the battery location along with MSD box and assorted relays.
The coil wire runs from the coil....down to the bottom of the old battery tray area....across under the waterpump area and up to the distrib.    I have a pretty long one by most measurements!!
I have to be careful  I don't  shoot past  my "pre-determined" redline of 55/57 hundred RPM redline by accident!(when acting like a teenager) soooooo it certainly hasn't hurt my ability to rev!
6sal6

Most stock Ford coils (other than 289) were mounted horizontally on the intake manifold. Not sure where it has ever been stated a coil must be mounted vertically.  The stock 289 vertical location in front of the head works well because the fan provides good air flow to cool it.  Laying it down horizontally on the intake works well, also.

I always found it odd that they mounted coils horizontally knowing that they were oil filled.  I mean, you don't see power pole transformers mounted horizontally.  That's what a coil is after all, and both are oil filled.  I've never owned a vehicle where the coil was mounted horizontally, so I can't comment directly on whether or not it affects the longevity, but it certainly doesn't seem right.  Of course its fair to say would Ford have done it for so long if it had been a liability from a warranty standpoint?  Of course the counterpoint is that warranties were much shorter back when these cars were new than they are today.  Interesting either way I think. 

TKOPerformance wrote:

I always found it odd that they mounted coils horizontally knowing that they were oil filled.  I mean, you don't see power pole transformers mounted horizontally.  That's what a coil is after all, and both are oil filled.  I've never owned a vehicle where the coil was mounted horizontally, so I can't comment directly on whether or not it affects the longevity, but it certainly doesn't seem right.  Of course its fair to say would Ford have done it for so long if it had been a liability from a warranty standpoint?  Of course the counterpoint is that warranties were much shorter back when these cars were new than they are today.  Interesting either way I think. 

The OE Ford coils are not oil filled
 

Grabber Blu wrote:

TKOPerformance wrote:

I always found it odd that they mounted coils horizontally knowing that they were oil filled.  I mean, you don't see power pole transformers mounted horizontally.  That's what a coil is after all, and both are oil filled.  I've never owned a vehicle where the coil was mounted horizontally, so I can't comment directly on whether or not it affects the longevity, but it certainly doesn't seem right.  Of course its fair to say would Ford have done it for so long if it had been a liability from a warranty standpoint?  Of course the counterpoint is that warranties were much shorter back when these cars were new than they are today.  Interesting either way I think. 

The OE Ford coils are not oil filled
 

Then that explains it and makes perfect sense.