The Smithsonian motor works engine kit by NSI helps you build a real working battery-powered 4-cylinder model engine with real valves rock, spark plugs fire and pistons drive crankshaft! It includes lights and sounds and you can watch the spark plugs fire and the valves open and close. See how the pistons fire with the correct timing and watch the belts and fan turn. Includes: 2 Washers 2 Shafts in various lengths 4 Exhaust Valves 4 Intake Valves 8 Valve Stems 4 Piston Halves 4 Connecting Rods 8 Timing Cams 8 Rocker Arms 1 Crankshaft 1 Crankshaft Pulley 1 Fan Pulley 1 Fan 1 Engine Mounting stand 5 Bearings 1 Clutch Housing 1 Oil-Pan 1 Lower Crankcase 1 Rocker Arm Cover 1 Upper Cylinder Head 1 Timing Belt 1 Timing Wheel 1 Timing Gear 1 Belt Tensioning Pulley 1 Lower Cylinder Head 1 Cylinder Block 1 Dipstick 1 Positioning Jig 1 Timing Belt cover 1 Intake Manifold 1 Exhaust Manifold 1 Carburetor Cover 1 Carburetor Bowl 1 Front Half of Water Pump 1 Rear Half of Water Pump 1 Flywheel clutch 1 Fan Belt 1 head Basket 8 Valve Springs 1 Distributor Assembly 1 Drive Module 1 Battery Pack 67 Screws Ages 8+ Uses 2 AA batteries, not included Warning: contains small parts Not suitable for children under 3 years 30-day limited liability warranty Imported Material & Care Plastic Spot clean only