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Big block Corvettes began in 1965, with this engine.

67HEAVEN

Well-known user
Lower horsepower (designated Passenger versions by Chevrolet) big-blocks were NOT offered in 1965. The only big-block offered was the RPO L78 396 c.i. / 425hp (designated Hi-Performance). This is the engine that supplanted the fuel-injected RPO L84 327 c.i. small-block. Lower horsepower versions of the larger-bore RPO L36 427 c.i. / 390hp big-block would appear in 1966, as well as the hi-performance RPO L72 427 / 450hp (later re-designated 425hp) big-block.

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