SOURCES AT General Motors Corp. say that the inline 4- and 5-cyl. engines to be derived from the recently launched Vortec 4200 I-6 (see WEVTU — Oct. 15, '00, p.3) will employ twin balance shafts built into the block. The vibration-smoothing balance shafts “really weren't needed” for the I-5, says the source, but will improve NVH for the I-4 variant. The use of balance shafts does mean, however, that a markedly different aluminum casting will be required for the blocks, although bore centers ...

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