What is the timing for a 91 astro van 4.3 liter?

The timing for a 1991 Astro Van with a 4.3-liter engine is set at 0 degrees BTDC (Before Top Dead Center) for the initial timing. It's important to check the specific timing specifications in the vehicle's service manual, as the timing could be influenced by factors such as the type of ignition system and any modifications. Always ensure the engine is at operating temperature and use a timing light for accurate adjustments.