Mike's holy grail basement find, 1956 Corvette with Rare Duntov Cam, and one heck of a story.

The magazine article link https://www.corvetteblogger.com/2016/... The 1956 Chevrolet Corvette featuring Regular Production Option (RPO) 449 is one of the most legendary, high-performance, and sought-after variations of the first-generation (C1) Corvette. The "Duntov" Camshaft RPO 449 specified the Special High-Lift Camshaft. Developed by Chevrolet’s legendary engineer Zora Arkus-Duntov, this component is universally known among enthusiasts as the "Duntov Cam". The Purpose: It was explicitly designed and marketed by Chevrolet "for racing purposes only". The Power Boost: When paired with the 265-cubic-inch small-block V8, it raised the vehicle's output from the standard dual-four-barrel rating of 225 horsepower up to an unofficial 240 horsepower. Mechanical Identity: These factory performance engines are highly distinct and can be identified by the "GU" block suffix code, which was exclusive to this configuration. Production Rarity Out of the 3,467 Corvettes manufactured for the 1956 model year, only 111 cars were factory-equipped with the RPO 449 camshaft. This minuscule production run makes it an incredibly rare piece of automotive history. Required Packaging To order RPO 449 from the factory, a buyer had to select a very specific mechanical setup: Dual-Quad Carburetors: It was only available in tandem with RPO 469, the 265 ci engine utilizing dual 4-barrel Carter carburetors. Manual Transmission Only: The high-revving nature of the mechanical lifter Duntov cam was incompatible with GM's early automatic transmission. Consequently, RPO 449 cars could only be ordered with the standard 3-speed manual transmission. Original Cost: At the time, opting for the Special High-Lift Camshaft added an extra $188.30 to the vehicle's base price. Because of its direct tie to Zora Arkus-Duntov's early efforts to transform the Corvette into a legitimate, world-class racing machine, a genuine, numbers-matching 1956 RPO 449 Corvette is considered a crown jewel for classic car collectors. Are you looking to buy or verify a 1956 Corvette with this engine option, or are you researching its historical racing record? The 1956 Chevrolet Corvette with Regular Production Option (RPO) 449 is one of the rarest, most legendary, and highly sought-after variants of the first-generation (C1) Corvette. What is Option 449? ​RPO 449 designates the Special High-Lift Camshaft. Better known to enthusiasts as the legendary "Duntov Cam" (named after Corvette's iconic chief engineer, Zora Arkus-Duntov), this factory option transformed the standard dual-quad setup into a track-ready performance machine. ​The Engine Setup: It was not a standalone engine option. To get it, a buyer had to first order RPO 469, which was the 265 cubic-inch small-block V8 equipped with dual four-barrel (2x4) Carter carburetors. ​The Power Bump: Adding the RPO 449 high-lift solid-lifter mechanical camshaft bumped the engine's official output from 225 horsepower up to an unofficial 240 horsepower. ​Racing Intent: Chevrolet explicitly recommended this combination "for racing purposes only." It gave the small-block a radical, choppy idle and high-RPM power delivery perfect for SCCA sports car racing. ​Production Rarity ​Because it was heavily marketed as a competition-only option that required frequent valve adjustments (due to the mechanical solid lifters), very few street buyers ordered it. Production Rarity ​Because it was heavily marketed as a competition-only option that required frequent valve adjustments (due to the mechanical solid lifters), very few street buyers ordered it. Metric Specification / Count Total 1956 Corvette Production 3,467 units Total RPO 449 Cars Built 111 units (roughly 3.2% of production) Original Option Cost $188.30 Engine Block Stamping Code "GU" Historical Significance ​The 1956 model year was a major turning point for the Corvette. After nearly being canceled in 1955 due to poor sales, the car was completely restyled for 1956 with the famous body-side "coves," roll-up windows, and proper exterior door handles. More importantly, under Zora Arkus-Duntov's engineering direction, options like RPO 449 finally gave the Corvette the genuine high-performance muscle it needed to establish its legacy as "America’s Sports Car." ​Today, an authentic, numbers-matching 1956 Corvette with the factory "GU-code" RPO 449 block is considered a holy grail piece among classic car collectors. #CarShow, #ClassicCar, #MuscleCars, #HotRod, #ford, #Model A, Sport Coupe,