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Any damper can be etched with timing marks into the outer ring to make setting total ignition timing easier. If you have your damper machined for timing marks, it should be rebalanced. MSD also offers timing tapes that can perform the same function for less money. You can also mark your own with paint at 36 and 40 degrees for example.
The Damper Dance

Any damper can be etched with timing marks into the outer ring to make setting total ignition timing easier. If you have your damper machined for timing marks, it should be rebalanced. MSD also offers timing tapes that can perform the same function for less money. You can also mark your own with paint at 36 and 40 degrees for example.  View Related Article