Cylinder head: Upper part of the engine. The air/fuel mixture enters through it and the exhaust gases come out.
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It contains the distribution system: the crankshaft, the tappet and the valves. Out of all of these mechanical systems of the engine, the cylinder is the most important in regards to performance. Its design and construction will determine how the engine will behave.
If the fuel injectors or fuel lines were damaged during the reconditioning process or were not properly reinstalled, it could cause problems with fuel delivery and prevent the car from starting