Description
Precise ignition timing is the foundation of peak engine performance, and the MSD adjustable rotor assembly puts that control directly in your hands. Whether you’re tuning a carbureted big-block or running a multi-step timing controller, this rotor allows you to dial in exact rotor-to-cap alignment for optimal spark delivery. Built for serious Ford V8 builders who refuse to leave performance on the table.
Technical Specifications:
- Adjustable rotor phasing
- MSD Pro-Billet compatible
- Ford V8 1972–1997
- CNC-machined construction
- Bolt-on installation
- Part Number: 8421
- 1-year limited warranty
- Excludes Ford FE (PN 8594)
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