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Power and blinding acceleration were the driving forces behind the development of the 1968-1969 Chevrolet Corvette 427. Only 390 1969 Corvettes were built with the famous L89 427 and while the L89 option was chosen 624 times in 1968, it is still a rare beast relative to total production. The 427 CI engine was good for 435 HP and a strong 460 lb-ft of torque making it one of the best-accelerating cars of its time. 
One special-edition Corvette was introduced in 2007 was based on the Corvette Pace Car that was used at the 91st running of the Indianapolis 500 driven by actor/racer Patrick Dempsey.  The significance of this car was the fact that GM had not produced a pace car replica since the 1998 model year, even though the Corvette had paced the prestigious event a bunch of times since then.
Corvette’s decision to become the official pace car of the Rolex 24 Hours at Daytona is a key component of Chevrolet’s strategy to reinforce Corvette’s image as "America’s Performance Icon." Jim Campbell, Corvette brand manager, is responsible for developing this strategy, and he’s the guiding force behind Corvette’s return to the racetrack.
While it was not the rarest Corvette Pace Car Replica ever manufactured by GM, the 1998 Chevrolet Corvette Pace Car Replica was – and remains – one of the most desirable pace car replicas ever made. This is primarily due to the fact that this replica is nearly identical to the actual pace cars that were used during the 1998 Indianapolis 500. It was fitting given that 1998 also marked the brand's 20th anniversary as "Official Pace Car" of this momentous race.
1978 was significant because it marked the cars 25th anniversary of production. Recognizing the achievement of manufacturing a car for a quarter-century, Chevrolet commemorated this accomplishment by introducing two special-edition Corvette that year.  The first of these was known as the "Silver Anniversary" edition Corvette.  It featured a two-tone silver over gray exterior with special pin-striping and special "25th Anniversary" badging.