题目内容
In general, the valves are held in the cylinder head instead of the cylinder block.
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In the first stroke, the exhaust valves are opened, letting the fuel-air mixture into the combustion chamber.
The camshaft is used to open and close the valves with the motion of the pistons.
DOHC means that there are two camshafts in the cylinder block.
Cylinder block or engine block is actually a complex machined casting unit.
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