1974 Brain Box saves the day.

Proper heat sink on a TO-220 board (Rev-n-Nator). you could mod the Chicom stuff if you wanted to get the TO-220 a place to send its heat.
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Yes, this will add to my post on page #58

Yes people are saying to proper heat sink the aftermarket ICU.

Here is a hack for the Standard Products LX100 Ignition Control Module that I am considering.

Take and drill a 1/2" hole through the fake (top hat) transistor on center, then take a 1/4" drill bit through the heat sink hole that lines up with the internal heat sink tab hole.

Drilling only deep enough to get through the outer skin of the ICM, to gain access to the inner heat sink tab.

Now take a stainless steel sheet screw of proper size and lenght. Screw it though the hole and catch the hole in the inner heat sink tab, carefully snugging it up to make the inner heat sink tab and the outer heat sink as one.

Dissipating the internal heat to the ICM case and outer heat sink. Without having to cut the whole ICM case open to see what is inside like I did for this demonstration.

I think people are on to something here to get the heat out of the internal chip.

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Some thoughts to add to the collective thinking on this subject.