47-55.1 Eliminate draft tube options

[TX3100Guy]

Originally Posted by 1project2many

I don't believe I would have a problem using an original distributor and an aftermarket electronic ignition. HEI is a readily available form of electronic ignition but it is not the only one. Pertronix may sell a sensor that can be installed in the distributor to replace the points if you'd like to trade points for a completely electronic system.

One consideration for this setup is based on the challenges you've already faced. Magneto service takes time and specialized knowledge. Spending time to design your wiring harness and ignition system for a relatively easy magneto to distributor swap allows you to keep a backup ignition system on the shelf.

For street use, either ignition system will be completely acceptable.

I completely agree. The fact is that I don't have an OEM distributor to work with and rather than spend the money on it an the kit to either add an HEI to it (Deve Tech has a DIY on that task) or add a Pertronix module, I have been pursuing another HEI distributor. I've reached out to the company to give me some dimensions so I can compare them to the Summit HEI I had to return. IF the head unit is just a shade smaller in circumference and/or the shaft is 1/2" taller, it will work.

Given the unexpected demise of the magneto the second time I started the rebuilt engine, having a backup HEI on the shelf is a no brainer. I'm pretty sure I can have the wiring in place for both the magneto and the HEI unit and be able to switch them out fairly easy. The magneto only needs a wire to ground it out and I've already wired in a relay on the ignition circuit to cause it to ground out when the ignition switch is turned off. The HEI unit needs a wire from the ignition circuit and a wire to the electronic tach.