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What is tri power on a 1967 Corvette?

On a 1967 Chevrolet Corvette, "Tri-Power" refers to the three two-barrel carburetors used on the optional 427 cubic inch V8 engine. It wasn't a separate engine, but rather a specific carburetion setup for that engine. Each carburetor fed a separate bank of cylinders, offering improved performance and throttle response compared to a single four-barrel carburetor.