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The Cross-Fire Injection 350 was standard on '81,'82, and '84 Corvettes. This engine produced 25 fewer horsepower and 40 fewer lb-ft of torque compared to the Tuned Port Injection (TPI) engine that replaced it in '85. Many feel the small, dual-throttle-body induction was a stop-gap measure intended to produce low emissions and decent fuel economy. But TPI would increase the latter by an average of 11 percent due to its direct-port nozzle placement.