Astra G
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Cylinder Head, X 18 XE1 The cylinder head in the X 18 XE1 is based on the DOHC I 4-valve head with the following deviations:
• Cylinder head with internal crankcase ventilation • Intake valve diameter 27.5 mm • Valve stem diameter 5 mm • New intake valve seat (due to new intake valve diameter) • Valve guides taken over from DOHC 0 engine • Exhaust gas recirculation valve installed directly on cylinder head
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