Ever since plans for the new compact cars got around Detroit, competitors of General Motors Corp. have been kicking at the rear engine G.M. will use in its Corvair. Chrysler Corp. President Lester Lum Colbert announced that Chrysler's small-car offering, the Valiant, would have its engine "up front, where it belongs." Ford Motor Co., whose small Falcon will also have a front engine, launched TV commercials demonstrating that an arrow weighted at the back end will fly erratically and miss the target, but that a "properly weighted" (i.e., heavy at the front) arrow will go straight to the mark.
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