The irony is sublime. Toyota has asked rival General Motors to supply an optional V-8 engine for an upcoming model of its new pickup truck. Until now, big pickups have been an exclusive--and highly lucrative--domain of the Big Three. This fall, however, Toyota plans to drive in with its T-100, powered with a V-6 engine. Most pickups are sold with V-8s, but Toyota doesn't make one that is suitable. GM hasn't decided whether to supply the engine. The move would keep its factory humming--but would increase competition for its trucks.

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