Navistar International Corp., St. Louis, Mo., has contracted metalcaster Cifunsa, Saltillo, Mexico, to produce compacted graphite iron (CGI) engine cylinder blocks for its new MaxxForce 7 diesel engines. Cifunsa began production on the CGI blocks for the 6.4 litre V8 diesel engine in January. The company has been working with CGI since 1993, when it began employing SinterCast process control technology, but…