If you've done the ignition resistor bypass, then yes. With 12V feeding the Pertronix and a 40kV coil, you'll have enough voltage to open up the plug gap to .040" or so.

 

Hey! I am aware that this thread is rather old, but I am just now facing this same issue. I can't seem to find a simple answer on this pink resistor wire. I am running a brand new summit racing RTR distributor and summit racing coil. The new dizzy needs the constant 12v, do you think you could give me the instructions on how to run a new wire from the ignition to the coil. I am pretty new to this so I am trying to learn. Also what kind of "new" wire do I need? What gauge?

 

The "pink" resistance wire feeding the stock factory ignition coil (through the ignition points) "drops" a few volts over it's length, leaving less than 13-14 volts or so (eng. running, alternator supplying power) at the coil. This concept dates all the way back to the days when the major car makers switched to 12 volts from 6. Intent was to protect the coil from the occasion when the key was left ON, eng. not running, and the ignition points happened to be closed; this overheated the coil. Most carbuilders used separate resistors, sometimes mounted on the firewall. Ford introduced the resistance wire feed back in the 60s.

Since they are usually PINK, this wire is easily traceable, running from the ignition switch to the coil. Simplest way to eliminate it is to just add a common, insulated copper wire running along with it, in parallel. The new wire may be connected at the ignition switch, same terminal as the pink, in the car, and the other end connected to the coil terminal along with the old pink one; you need not remove the pink wire at all. The effect electrically of paralleling the two is virtually the same as removing the pink and adding the fresh new wire. Use wire having high-temperature rated insulation; it gets HOT under hood. Insulation type THHN/THWN is ideal, having a nylon outer wrap. Size the wire sensibly, #16 AWG is big enough to carry 10 amps. I would go no SMALLER than # 18. If leaving the pink wire in place makes you "squirrely", go ahead and remove it.