End Of An Era
1967 was the last year of the "mid year" C2 Corvettes, as the 1963 through 1967 models were known. The styling that shook the world in 1963 had proved itself everywhere, including critical praise and a sales volume that would not quit. Every model year saw a sales increase through 1966; Things cooled down for 1967 in part because it was known that a new body style would be introduced in 1968.
For all cars, 1967 would be a pivotal year. Safety and smog requirements would become the law starting in 1968 and the new regulations would affect performance cars profoundly.
Big blocks continued to be the way to go for Corvette purchasers in 1967; of the five engine options available, four were 427 cu. in. displacement. Multiple carburetors were the secret on the L68 (400 hp, production quantity: 2,101 (9.16%), $306) and L71 (435 hp, production quantity: 3,754 (16.36%), $437) motors. They had been used with great success in the Pontiac GTO but a GM corporate ban caused them to disappear from the Pontiac. Corvette was exempted however and three 2 bbl. Holly carburetors (below) were mounted on top of an aluminum manifold. The center carb was used in normal operation; above 2000 RPM the front and rear units kicked in. Good fuel economy was part of the bargain since only one carburetor was in use most of the time.
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Source: The Corvette Story