Cylinder Head Assembly: Description and Operation

Cylinder heads are unique to each cylinder bank with deep-seated bolts securing the cylinder heads to the cylinder block. Two hollow dowels align each cylinder head with the cylinder block.

Each cylinder head gasket consists of a silicon-beaded composite gasket with metal eyelets for the cylinder bores.

Each cylinder head incorporates dual overhead camshafts operating four valves per cylinder via solid aluminum-alloy valve lifters. Steel shims in the tops of the lifters allow valve-clearances adjustment.

Valve-head diameters are 31 mm for exhaust and 35 mm for intake. All valves have 5 mm diameter stems supported in sintered metal seats and guide inserts.

Collets, valve collars and spring seats locate the valve springs on both intake and exhaust valves. Valve-stem seals are integrated into the spring seats.

Four 14 mm spark plugs are located in recess on the center-line of each cylinder head.