Navistar International Corp.’s International Truck and Engine Corp., longtime maker of diesel engines and commercial trucks, will introduce next year an all-new line of “big-bore” diesel engines for heavy-duty trucks that use compacted graphite iron (CGI), an advanced iron formula that is stronger, yet demonstrably lighter than the conventional gray iron from which most diesel engine blocks are cast. International’s move is another boost for CGI, whose proponents have spent years ...

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