The cylinder head is a one-piece cylinder head in aluminium alloy.The four valves per cylinder are fitted in the guides, operated by two camshafts by means of hydraulic tappets.The valve guides are an interference fit in the cylinder head seats. A special reamer is used to produce the correct inner diameter after fitting.The camshafts are fitted in the camshaft housings, without a tappet cover.The gasket between cylinder head and cylinder block is the "multi-layer metallic" type 0.72 mm thick and the head does not require retightening throughout the engine life.
