This taller, one-piece Pro Mag 12 housing is built for Chevrolet engine blocks with taller deck heights. An adjustable slip collar provides easy adjustment of the magneto and cam gear alignment — critical for engines with varying deck heights, custom heads, and modified intakes.
Specifications:
- Fitment: Chevrolet V8, Tall Deck Height
- Amperage: 12 Amp
- Included: Cap, rotor, wire retainer, bronze gear, Billet Hold-Down Clamp
- Adjustment: Slip collar for magneto/cam gear alignment
- Type: Generator/Magneto
- Part Number: 8139MSD
Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
FAQ
What is this tall housing designed for?
It's built for Chevrolet engine blocks with taller deck heights, custom heads, or modified intakes.
What does the adjustable slip collar do?
It allows easy adjustment of the magneto and cam gear alignment to match varying deck heights.
What's included with the MSD 8139MSD?
A cap, rotor, wire retainer, bronze gear, and a Billet Hold-Down Clamp.
Is this generator legal for street use?
No — it's legal for Racing Use Only vehicles that are not registered or operated on the street.
