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dewdude007
07-03-2009, 12:22 PM
I have a 79 s&s with a 351w. I have a quick question for you guys: What is box on the back of the motor marked PCM? It has a red reset button on it. Under the PCM cover there are a few wires and a couple of unidentified boxes.

WilliM1940
07-03-2009, 12:33 PM
It is your electrical interface to the engine. Manuals for your engine for full explanation can be had here:
http://www.correctcraftfan.com/reference/manuals.asp