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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Apr 2000 Posts: 499 'Bolter | | 'Bolter Joined: Apr 2000 Posts: 499 | I probably didn't explain that very well. The Motorola IC(Integrated Circuit) is part of what is inside the GM HEI. The drawing below that I found on the web is a quick and dirty depiction of the HEI module. The Motorola portion is what they are calling a signal converter. The npn transistor is actually a Darlington power transistor labeled MJ10012 in the block diagram in my previous link. http://www.jetav8r.com/Vision/Ignition/hei.gif
'67 GMC 3/4 292 4spd
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