There isn't a single "distributor setting" for a 1996 Chevy Blazer 4.3L V6. These engines use a
Distributorless Ignition System (DIS). This means there's no distributor with a rotating rotor and adjustable points or timing. The ignition timing is controlled electronically by the PCM (Powertrain Control Module).
Therefore, there's nothing to adjust in the way a traditional distributor would be. Any timing adjustments would be done through diagnostic equipment connected to the PCM. If you are having ignition problems, you should consult a mechanic or use a professional-grade scan tool.
