A regular non-interference engine, also known as a "free-running" or "freewheeling" engine, is designed so that the valves and the pistons will never occupy the same space within the cylinders.

Q: You once suggested readers check if their vehicles have a timing belt or timing chain. Can you also determine if my 2008 Toyota Corolla LE is interference or non-interference engine?

A timing belt failure in a non-interference engine will leave you inconveniently stranded. Timing belts are a maintenance item; they can wear out and fail without warning. Check your owner’s manual.