* Engine application: Was it in a car, truck, or boat? Different applications might have slightly different specifications.
* Engine modifications: Has the engine been modified in any way (camshaft, carburetor, etc.)? Modifications significantly impact timing.
* Emission controls: The timing specification will vary depending on the emission control system fitted to the vehicle.
To find the correct timing for *your* 1975 302:
1. Locate your owner's manual: This is the best place to start. It should specify the correct base timing and any procedural details.
2. Check a reputable repair manual: A Haynes, Chilton, or factory service manual for your specific vehicle year and model will provide the correct timing specifications. These manuals often offer detailed instructions on how to check and adjust the timing.
3. Look for a sticker under the hood: Some vehicles have a sticker under the hood near the radiator or on the air cleaner housing that lists specifications, including timing.
Without knowing the specifics of your 302's application and modifications, any timing figure I give would be a guess and potentially harmful to your engine. Improper ignition timing can lead to poor performance, damage to engine components, or even engine failure. Always consult your owner's manual or a reliable repair manual for accurate information.
