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Across 1. metal casting that holds all the other engine parts 4. controls the flow of air-fuel mixture and exhaust gases 5. change up and down motion into spinning motion 9. ride on the camshaft and transfer motion to the other part of the valve train 11. cover and seals the top of the cylinder. It also hold the valves and rocker arms 12. keep the valves close when they don't need to be open

Down 2. is a round hole bored in the block. It guides piston movement 3. control the opening of the valves 6. helps the crankshaft turning smoothly. work also with the starter 7. is a cylindrical component that transfer energy to the connecting rod 8. seal the gap around the sides of the piston 10. links the piston to the crankshaft