This model of a small-block Chevrolet engine includes all internal details housed in a clear plastic engine block so the function of each component can be seen in action. The model is offered as a kit by Revell. A crank at the rear end of the crankshaft turns the engine over as the viewer can see the pistons, camshaft, rocker arms and valves all move in the proper sequence. Rubber belts drive the alternator, water pump and fan as well. At approximately 1/4 scale, it is large enough to really see what’s going on and is a great way to illustrate how a modern internal combustion engine works. In addition to the assembly instructions, an informative book on internal combustion engines is included. This kit is still available on the Revell website.