The Digital Multi-Retard provides four independent, adjustable retard stages (0°-9° each, up to 20° total) plus an optional start retard circuit programmable to 5°, 10°, 15°, or 20° while cranking — all without separate plug-in modules. A high-speed RISC microcontroller holds timing accuracy within 1° and includes a built-in magnetic pickup compensation circuit for rock-steady timing with a variety of mag pickups. It works on 4, 6, or 8-cylinder engines and must be used with an MSD ignition control.
Specifications:
- Brand: MSD
- Category: Engine
- Product Type: Retard Control
- Sub Category: Valve Train Components
- Warning: California Proposition 65
- Warranty: Manufacturer's Limited 1 Year Warranty
- Part Number: 8975
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
How many retard stages does the MSD 8975 offer?
Four independent stages, each adjustable 0°-9°, for up to 20° of total retard.
Does the 8975 need separate RPM/retard modules?
No, all stages and the optional start retard are programmed digitally with no separate modules.
Is the MSD 8975 legal for street use?
No — it's legal for sale and use only on Racing Use Only vehicles (unregistered competition vehicles never operated on the street). Installing it on an emissions-controlled street vehicle is against the law.
What does the 8975 require to operate?
It must be used with an MSD ignition control and works on 4, 6, or 8-cylinder engines.
