engine timing

What is a SUBARU non-interference engine?

What does it mean if a SUBARU engine is 'non-interference'?  Engines are designated as interference or non-interference.

In a non-interference SUBARU engine, there is no possibility of the pistons and valves coming into contact with each other.  In other words, there is enough clearance between the piston at TDC (top dead center) and the fully open exhaust and/or intake valves so that they do not touch (interfere). 

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What is a SUBARU interference engine?

So what does it mean if a SUBARU engine is 'interference'?  SUBARU engines are often designated as interference or non-interference. 

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