What is the base timing on a 1975 Chevy Corvette?

There's no single base timing specification for a 1975 Chevy Corvette. The base timing varies depending on the engine it's equipped with (the small-block V8s and big-block V8s had different specifications, and even variations *within* those engine families existed). Also, the exact specification might be slightly different depending on the emission control system used in that particular year and model.

To find the correct base timing for *your* 1975 Corvette, you need to:

1. Identify your engine: Is it a 350 cubic inch (small-block), a 454 cubic inch (big-block), or another variant?

2. Locate the owner's manual: This is the best source for the manufacturer's recommended base timing.

3. Check a Chevrolet repair manual specific to your engine: These manuals provide detailed specifications, including base timing.

4. Look for a sticker under the hood: Sometimes a sticker on the air cleaner or radiator support will list the base timing. This isn't always present.

Without knowing the specific engine, it's impossible to give you a definitive answer. Attempting to use an incorrect base timing can damage your engine.