However, it's crucial to understand that this is a theoretical ideal. The actual ideal ratio might vary slightly depending on factors like engine load, temperature, and altitude. Furthermore, a slightly richer mixture (slightly more fuel) might be used during cold starts or high load situations for better performance and to prevent stalling.
You cannot simply set your carburetor to 14.7:1 and expect it to be perfect. Proper carburetor tuning requires specialized tools and knowledge, often involving adjusting the idle mixture screws, air bleeds, and possibly jets to achieve optimal performance and emissions. It's best to consult a repair manual specific to your Tahoe's engine and carburetor (e.g., a Rochester Quadrajet or similar) or seek the help of a qualified mechanic for proper carburetor tuning. Improper tuning can lead to poor fuel economy, power loss, and even engine damage.
