The Pertronix Ignitor II lobe sensor conversion kit replaces the breaker points inside Autolite and Prestolite 8-cylinder distributors with a solid state module. The lobe sensor triggers off the distributor cam, and adaptive dwell control keeps spark energy consistent across the RPM range. The module installs under the stock cap for a factory appearance.
- Type: Ignitor II points to electronic conversion kit
- Trigger: lobe sensor (distributor cam), with adaptive dwell control
- Voltage: 12 volt
- Ground: negative ground
- Cylinders: 8
- Fits: Autolite and Prestolite 8-cylinder distributors (verify the distributor number)
- Sold as: kit
- Part number: 91581LS
FAQ
Which distributors does 91581LS fit?
It is designed for Autolite and Prestolite 8-cylinder distributors. Confirm the original distributor number against the Pertronix list before ordering.
Why a lobe sensor version?
The lobe sensor triggers off the distributor cam lobes, which suits these Autolite and Prestolite units while retaining the stock appearance.
Is it 12 volt negative ground?
Yes, part 91581LS is built for 12 volt negative ground systems.
Does it eliminate points maintenance?
Yes. The Ignitor II module removes the points and condenser and is maintenance free.

