SOURCES REPORT that General Motors Corp. has finalized plans to specify extruded aluminum engine cradles for some large-volume vehicle programs. The new Chevrolet Impala and Monte Carlo reportedly will be the first GM vehicles to employ the new aluminum cradles. Although GM is a strong advocate of new hydroforming processes for steel — as used, for example, in the front members of its GMT800 truck frames — the aluminum engine cradles will produce a weight savings better than hydroformed ...

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