Is a 1992 Chevy Sprint or Metro 3 cylinder engine clearance and would the valves be damaged in event of timing belt failure?

The 1992 Chevy Sprint and Geo Metro both used a 3-cylinder engine (either the 1.0L or the slightly larger 1.3L, depending on the model). These engines are interference engines.

This means that if the timing belt breaks, the pistons and valves can collide, resulting in bent or broken valves and potentially other significant internal engine damage. It's not a matter of *would* the valves be damaged, but *will* the valves be damaged in a timing belt failure. Repairing this type of damage is usually very expensive, often exceeding the value of the vehicle.