Chevrolet Corvette 427/425 Roadster

The all-new Mark IV 396-cubic inch big-block V8 engine was released, distancing the Corvette even further from the competition. The Mark IV was in fact derived from the 427-cubic inch “mystery motor” that was campaigned by stock car legend Junior Johnson in 1963 and ultimately banned from NASCAR. Alternatively called the “porcupine” engine due to its unique valvetrain geometry, the Mark IV 396 V8 produced 425 hp.

The 396 option also specified a mandatory transistorized ignition system and a four-speed manual transmission, while air conditioning was not available. Despite its considerable weight of 650 pounds, the 396 did not adversely affect the Corvette’s near-perfect weight distribution. Finally, all Corvettes received a set of four-wheel disc brakes with four-piston calipers and ventilated rotors, providing fade-free stopping power to match their incredible forward thrust.

This car was auctioned off by RM Auctions in June of 2010 in San Diego, California and the event for John Staluppi in December, 2012.

425 bhp, RPO L72 427 cu. in. V8 engine, Holley four-barrel carburetor, Muncie four-speed manual transmission, independent front suspension with upper and lower A-arms and coil springs, independent rear suspension with half-shafts, lateral struts, radius rods and a single transverse leaf spring, and four-wheel hydraulic disc brakes. Wheelbase: 98".

Sources: RM Auctions; Mecum Auctions
Photo Credit: Copyright Darin Schnabel; Teddy Pieper

Gallery: Chevrolet Corvette 427/425 Roadster