• What's a non interference engine? Does that mean the valve lift is so small that it won't smack the piston at full lift at TDC if the belt snaps?

  • Yes. Not necessarily as a result of low valve lift, however - it could also be low compression so there's plenty of space between the valves and the piston. Valve timing also plays a part. But as a rule of thumb, funkeh engines are interference, boggo cooking engines are non-interference. Not a rule of thumb to rely on though. Ever.

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