* Year of manufacture: Pontiac 301s were produced over several years, and factory specifications changed.
* Engine modifications: Modifications like camshaft changes, carburetor adjustments, or different ignition systems will dramatically alter the ideal timing.
* Fuel type: The type of fuel used (regular, premium, etc.) can influence the best timing setting.
Instead of a specific number, you should consult:
* Your engine's service manual: This is the most reliable source. It will provide the factory-recommended initial timing setting for your specific year and model.
* A reputable mechanic: A qualified mechanic can diagnose your engine's condition and recommend the appropriate timing.
Trying to guess the timing without this information can lead to engine damage. Improper timing can cause problems ranging from poor performance and reduced fuel economy to catastrophic engine failure.
