Phase-down is underway for production of General Motors Corp.'s “Gen I” 5L and 5.7L Vortec OHV V-8s for GMT400 trucks at its St. Catherines, Ont., production site, idling about 300 employees. Timing for the Gen I to be entirely phased out at St. Catherines will depend on demand. The plant will continue to build Gen III 4.8L and 5.3L Vortec V-8s for the new GMT800 trucks, and also do machining for Gen III 5.7L Corvette (aluminum-block) V-8s. The first General Motors Corp. vehicle to use a ...

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