Time to put on your thinking caps, VETTE readers!

For each engine, we'll give you a hint. You tell us the small-block Chevy engine and the year it was first produced.

 Let's get started.
3. When this engine was introduced it was first time since 1965 that Corvette fans could buy a new Corvette that came close to Chevy factory-fuel-injected horsepower ratings for a small-block production vehicle, but with a four-barrel carburetor.