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Totally agree with
" thought that I knew that the ignition coil will only put out the voltage required to fire the charge. If you have a 40K coil and only 8K is required to fire the charge, you will only get 8K out of the coil. Using a 40K coil will only benefit if you need voltage up to 40K."
BUT , Ford designed heads , position of spark plugs and top of pistons to have a normal 15KV and maximum of 30KV in there . ( 30KV with engine under load or high speeds.)
Installing coils with capacity beyond 30KV ( to 40Kv or 50KV ) and spark will jump to top of pistons and burn a hole in top of the factory piston.
Install racing pistons and racing heads with hot coils you can do it to it.
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