The MSD GM LT1 5.7L distributor for late-1994 through 1997 applications is machined from a solid billet block of aluminum into a precise housing that replaces the factory Optispark, using a pin-drive rotor for these later applications. It uses a reliable optical-encoder pickup, proven stable through extreme rpm and conditions, with the rotor bolted to a drive assembly indexed to the shaft and stabilized by a large ball bearing. It offers adjustable timing via an adjustment screw that tweaks timing up to +/-5 degrees, and the fresh-air-vented housing has an extra-thick cap mounting surface to eliminate leaks. It's supplied complete with a heavy-duty LT1 cap, rotor, and the components needed for installation.
Specifications:
- Application: Late 1994 thru 1997
- Warranty: Manufacturer's Limited 1 Year Warranty
- Part Number: 83811
Pin drive; fits GM LT1 5.7L applications late 1994 through 1997.
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
Is the MSD 83811 legal for street use?
No, it's legal for sale and use on Racing Use Only vehicles only, and installing it on an emissions-controlled street vehicle is against the law.
What vehicles is the MSD 83811 built for?
GM LT1 5.7L applications from late 1994 through 1997, using a pin-drive rotor.
Can the timing be adjusted on the 83811?
Yes, an adjustment screw lets timing be tweaked up to +/-5 degrees — the only LT1 Optispark replacement offering timing adjustability.
What keeps the 83811's rotor drive from slipping?
The rotor drive design is positively indexed and stabilized by a large ball bearing, holding steady through 10,000 rpm.
