Originally posted by DemonSVT:
Originally posted by MarkO:
Correct me if I'm wrong but non-interference engines have spaces or shaping in the top of the piston to accomodate the valves in the event of a catastrophic fail.
You are wrong to use that as a point of reference.
The valve reliefs cut into the pistons are only done on engines that require it so the 2 parts do not meet while moving. It still can be an interference or non-interference engine.
For instance the 3L Duratec has valve reliefs cut in the pistons due to the close tolerances and it's an interference engine.
I stand corrected !! 
Bless our servicemen & women overseas.
L.Cpl Ian Malone, 1st Battalion Irish Guards, R.I.P.
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