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MSD Manuals & User Guides

MSD is a premier manufacturer of high-performance automotive ignition systems, including ignition boxes, distributors, coils, and spark plug wires.

Tip: include the full model number printed on your MSD label for the best match.

MSD Support

Official site: https://www.msdperformance.com
General support: https://www.holley.com/support/
Warranty & registration: Warranty info · Register a product
Support phone: 1-866-464-6553 — Monday - Friday, 7:00 a.m. to 7:00 p.m. CST
Contact form: Contact manufacturer support

MSD manuals

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MSD 6AL-2 Ignition Control Unit Instruction Manual

6421 • June 19, 2025

Comprehensive instruction manual for the MSD 6421 6AL-2 Ignition Control with 2-Step Rev Limiter, covering setup, operation, maintenance, and specifications.

MSD 8676 Retard Selector Switch User Manual

MSD-8676 • June 12, 2025

Comprehensive user manual for the MSD 8676 Retard Selector Switch, covering product overview, safety, installation, operation, maintenance, troubleshooting, and detailed specifications.