Will a 2.8 throttle body work on 4.3 motor?

A 2.8 throttle body can be used on a 4.3 motor, but modifications may be necessary for proper fitment and performance. The 4.3 engine typically has a larger throttle body to match its increased airflow requirements. If you're considering this swap, ensure that the intake manifold and other components are compatible to avoid potential issues. Ultimately, while it may work, you might not achieve optimal performance without further adjustments.