You're right, a quick google delivers this:



"...a pristine '67 427 Corvette Sting Ray he cherished over everything else. That '67, in the reality outside of TV-land, was then (and still is) owned by Bill Marquardt of Bloomington, Illinois. The Corvette was featured in two episodes of the show..." http://www.corvettefever.com/featuredvehicles/corp_0506_1967_chevy_427_corvette_- stingray/index.html