* Year of manufacture: The engine's design and recommended timing changed over the decades the 350 was produced.
* Engine modifications: Modifications like camshaft upgrades, carburetor changes, or the addition of a turbocharger/supercharger drastically alter the ideal timing.
* Fuel type: The type of fuel (regular, premium, etc.) influences the optimal timing.
* Engine condition: Worn components can affect the ideal timing.
Instead of a specific number, you need to consult:
* Your engine's specific specifications: Look for a sticker under the hood or in the owner's manual (if you have one). This may provide the manufacturer's recommended base timing.
* A repair manual: A Haynes or Chilton manual for your specific year and model Chevy will give detailed instructions on checking and setting the timing correctly.
* A professional mechanic: They can diagnose your engine and set the timing accurately using specialized equipment.
Trying to guess the timing without this information is risky and could damage your engine. Improper timing can lead to poor performance, reduced fuel economy, and even engine damage.
