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The Z06 arrived for the 2006 model year as a homologation vehicle in the third quarter of 2005 and is the lightest of all Corvette models. The Z06 was equipped with the largest-displacement small-block engine ever produced, a new 7,011 cc (7.0 L; 427.8 cu in) V8 engine codenamed the LS7. The engine has a power output of 505 hp and 470 lb⋅ft.
There were several successful attempts to build a convertible ZR-1, most of them by private people. The DR-1 was a GM prototype to test the structural integrity of the ZR-1 chassis when it would be topless. The car was built by American Sunroof Corporation (ASC) for Don Runkle, who was the vice-president of Advanced Engineering Staff, which explains the “DR-1” designation. It was a standard convertible transformed to ZR-1 specs.
For competition, race customers had a range of options available to them including the N03 36-Gallon Fuel Tank, closer rear axle ratios and the C48 Heater/Defroster Delete (-100). Most cars equipped like this came with either L78 or the L84 with Ram-Jet Fuel Injection.
In 2005, the Corvette was chosen as the official pace car of the 47th Daytona 500. The car was based on a 2005 production model Corvette and it presented an excellent opportunity for the 2005 Corvette to showcase its true capabilities. The pace car was designed to honor the heritage of the historic Corvette race cars of yesteryear. It was finished in millennium yellow with over-the-top black racing stripe that runs from the hood to the trunk lid. It is powered by a 6.0L V-8 LS2 engine with 400 horsepower.
The early C4's had their problems, what with the 1984 Cross-Fire Injection and its unusual 4+3 manual transmission. By the late 1980's, the fourth-generation Corvette had evolved into a more desirable automobile, thanks in part to the arrival of the ZR-1.