Editing Hot rodding the HEI distributor (section)
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===Cap and rotor=== Use caps and rotors that have brass terminals. Aluminum is cheaper- but in this case you really do get what you pay for. The center carbon electrode button, or "rotor bushing" in the drawing below is what transmits the current from the coil to the rotor, and should be a quality part. Cheap/offshore buttons can have excessive resistance; this causes heat and can in extreme cases melt the surrounding plastic of the cap and the engine will quit. The button has to be assembled into the cap first, then the rubber insulator. The small spring on the button goes against the bottom of the coil. Use dielectric grease on both sides of the rubber insulator. [[File:HEI CAP- ELECTRODE- INSULATOR- COIL DIAGRAM.jpg|thumb|330px||Drawing of cap and coil, related parts.]]
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