Cylinder head

Part of S58 engine · about $5,200 to replace

What it is

Aluminium DOHC 24-valve head with a 3D-printed core for the coolant jacket.

What it does

Seals the combustion chambers, guides intake/exhaust flow, carries camshafts and valvetrain.

How it fails

Valve-cover gasket seep at 80,000+ km; head itself rarely fails.

Material	Cast aluminium, sintered valve seats
Spec	4 valves/cyl
	intake 32 mm, exhaust 28 mm
	24 kg

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