Timing Light Accuracy

toolmanmike said
What ignition system are you running. Multispark can mess with most lights.

The ignition is a GM HEI module, Mallory-style MP electronic distributor, and MSD blaster SS e-core coil.

Murray said
Had a nice Fox Valley I used for years until I built a race car and started to question the accuracy of my old light because of a comment by MSD. Bought a new MSD light. Don't know if it is better- But I feel better.

Did you ever check one light against the other?