* Cam Shaft: Different camshafts (stock, aftermarket performance, etc.) will have different optimal timing settings.
* Ignition System: The condition and type of ignition system (points, electronic) impacts timing requirements.
* Engine Modifications: Any modifications to the engine (e.g., higher compression ratio, different carburetor) will affect optimal timing.
* Fuel: The type of fuel used can also influence ideal timing.
Instead of a specific number, you need to consult your owner's manual (if you have it) or a reputable Oldsmobile repair manual. These manuals will typically provide a *starting point* for the timing, often expressed as degrees before top dead center (BTDC) at a specific engine speed (e.g., 8-12 degrees BTDC at idle).
To find the correct timing for *your* specific engine:
1. Consult a Repair Manual: This is the best approach. A Haynes or Chilton manual for your specific year and model will give the recommended baseline timing.
2. Check the Distributor: Look for markings on the distributor itself. Sometimes the factory timing is marked on the distributor housing. This is less reliable than a manual but might offer a clue.
3. Use a Timing Light: Even with a starting point, you'll need a timing light to set the timing correctly. The procedure typically involves:
* Connecting the timing light.
* Finding the timing mark on the harmonic balancer (or crankshaft pulley).
* Adjusting the distributor until the timing light shows the correct advance.
Important Note: Incorrect timing can seriously damage your engine. If you're not comfortable working on your car's ignition system, it's best to take it to a qualified mechanic.
