Sbc Hei Wiring Diagram

Wiring the Chevy 350 HEI Distributor: A Comprehensive Guide

Understanding the HEI Distributor's Unique Configuration

The GM HEI (High Energy Ignition) distributor is renowned for its efficient ignition system and unique wiring requirements. Unlike conventional distributors, the HEI requires a 12-volt power source and a tachometer signal. To ensure optimal performance, it's crucial to follow the Chevy 350 HEI distributor wiring diagram accurately.

Step-by-Step Wiring Guide

1. Identify the Electrical Connections: Refer to the wiring diagram for your Chevy 350 engine to determine the correct wires for the HEI distributor. Typically, these include the 12-volt power supply, tachometer signal, coil connections, and ground wire. 2. Attach the Power Source and Tachometer Signal: Connect the positive terminal of the 12-volt power source to the "BAT" terminal on the HEI distributor and the negative terminal to the "GND" terminal. For the tachometer signal, connect the wire from the tachometer to the "TAC" terminal on the distributor. 3. Connect the Coil: The coil is responsible for generating the high-voltage spark. Connect the positive terminal of the coil to the "COIL+" terminal on the HEI distributor and the negative terminal to the "COIL-" terminal. 4. Ground the Distributor: A proper ground connection is essential for the distributor's proper operation. Attach the ground wire to the "GND" terminal on the HEI distributor and connect it to a clean ground point on the engine block or chassis. By carefully following the wiring diagram and these steps, you can ensure that the HEI distributor is wired correctly on your Chevy 350 engine, maximizing ignition performance and overall engine operation.