Rapom's Rocket - just another Duster build thread

And all put together into one little package. Sorry for the blurry photos, my camera doesn't take great closeups and is sensitive to movement during close shots, plus I just plain suck at photography.

I made a little bracket with a 90* bend to mount the heat sink/module to the back of the coil. The finned silver heat sink is for the HEI module which gets really hot and needs a way to keep cool or it will fry very quickly. There are lots of ways to do this from directly mounting it to firewall, inner fender, using the ACDelco heat sink made for that purpose or even computer heat sinks. Just don't forget the heat transfer paste that comes with the module. That little black module is equivalent to a factory ignition box and puts out a very healthy spark. Two leads go to the coil +/-, and the other two go to the distributor. I used the factory distributor wires I stripped out of my engine harness, shortened them up and crimped/soldered on female Packard 56 spade connectors and covers harvested from some scrap harnesses I keep around for such occasions. The black connector with the yellow, blue, red and black wires is to a relay to power the module. I took the power directly off the starter relay power stud with a 10 gauge wire as the module needs a steady 14 volts to work properly. That is just how I did it, there are many ways to accomplish the same thing. This is where the wiring mods start to get complicated to document and follow as I changed so much at one time. Try to follow the best you can.

I'm mounting the coil/module/relay on the flat of the firewall next to the windshield wiper motor (red circle). The white arrow is pointing to the relay which I conveniently covered with the red circle . This is close to the distributor and existing wire harness for routing purposes, is out of the way and may be a good spot for airflow for cooling too.

The last pic is the best HEI wiring schematic I've ever seen. I don't know who to give credit to as I copied it a long time ago during my research, but whoever you are cudos for a professional job! The only thing I would add to this is a ground wire from the B-C side mounting screw to ensure the module is grounded to a very good source.