In a 1999 Ford Ranger 3.0L V6 engine timing chain failure is there enough valve clearance to avoid damage?

No, there is not enough valve clearance in a 1999 Ford Ranger 3.0L V6 engine to avoid damage if the timing chain fails. These engines are interference engines. This means that if the timing chain breaks or slips, the pistons can collide with the valves, causing significant and expensive damage, including bent valves, damaged pistons, and potentially even a cracked cylinder head or block.