NSI49013: Smithsonian Motor-Works Visible 4-Cylinder Engine Kit

Rev your brain as you build, display and learn about engines with this Smithsonian Motor-Works model engine. Product Features: Four-cylinder model engine parts Valves rock, spark plugs fire and pistons drive crankshaft Product Details: Includes washers, 2 shafts, 4 exhaust valves, 4 intake valves, 8 valve stems, 4 piston valves, 4 connecting rods, 8 timing cams, 8 rocker arms, 1 crankshaft pulley, 1 fan pulley, 1 fan, 1 engine mounting stand, 5 bearings, 1 clutch housing, 1 oil pan & 1 lower crankcase Ages 8 years & up Requires 4 "AA" batteries (not included)