What is most likely to happen if piston ring end gap is too small?

If the piston ring end gap is too small, it can lead to excessive pressure buildup in the combustion chamber as the rings expand when heated. This can cause the rings to bind, preventing proper sealing and potentially leading to engine damage. Additionally, it may result in increased oil consumption and reduced engine performance due to poor combustion efficiency. Overall, maintaining the correct end gap is crucial for optimal engine operation.