MSD's cam sync plugs are designed for aftermarket sequential EFI systems with coil-per-cylinder ignition. The plug installs in place of a traditional distributor, providing a hall-effect cam sync signal so the EFI system can reference the #1 cylinder. It's plug-and-play with Holley EFI and interfaces easily with most other aftermarket EFI systems.
Specifications:
- Category: Ignition
- Engine: Chrysler 426/440
- Color: Black and Silver
- Distributor Type: Cam Sync Plug
- Sensor: Hall-Effect
- Ignition Box Required: EFI
- Shaft has a hardened, corrosion-resistant coating
- Part Number: 85231
FAQ
What does the MSD 85231 cam sync plug do?
It installs in place of a traditional distributor to provide a hall-effect cam sync signal referencing the #1 cylinder.
Is the MSD 85231 compatible with Holley EFI?
Yes, it's plug-and-play with Holley EFI and can also interface with most other aftermarket sequential EFI systems.
What engine is the MSD 85231 designed for?
It's designed for Chrysler 426 and 440 big block engines.
Is the shaft protected against corrosion?
Yes, the shaft has a hardened, corrosion-resistant coating for increased durability.

