The now-continual need to drive weight out of passenger vehicles means that converting the heavy mass of engine blocks from their traditional cast iron to aluminum practically is a requirement for any new-vehicle program. Aluminum engine blocks can weigh 40% to 50% less than a comparable cast-iron block. And aluminum's excellent thermal conductivity often permits smaller-capacity cooling systems. “I doubt there will be very many new passenger-car engine programs in the near future that ...

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