Am I still covered if I tell the insurance company I have a v6 firebird, when I really have a v8 trans am?

Incase you didn't know a trans am is the more expensive, high performance firebird with a v8? So if I list it as a v6 firebird, and I get in an accident, fender bender, or front end, needing engine repairs, will I be covered, or does this void the contract?