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Specifically manufactured for the make and model of your vehicle, the cylinder head bare is a bare casting which will need all the necessary components assembled to make a fully functional and complete cylinder head. The cylinder head is an integral part of a car's engine and consists of the coolant passages, along with the camshaft, intake and exhaust valves, intake and exhaust ports and valve springs, which will all need to be fitted to the cylinder head bare. 

The cylinder head, usually cast out of iron or aluminium, is fixed on top of the cylinder block, forming the top of the combustion chamber. Sandwiched between the cylinder head and cylinder block, acting as a sealant, is the head gasket.  

The job of the cylinder head is an important one. The cylinder head is comprised of a series of passages that carry the air and fuel combination needed for combustion to the cylinders;  the liquid coolant, needed to keep the engine cool; and harmful fumes (produced  in  the engine in the process of combustion) from the exhaust valves to the exhaust manifold and  away from the vehicle. In an air cooled engine, the cylinder head and cylinder block have fins on the outside that allows cool air, generated by a fan which is powered by the engine, to flow through the engine and keep it cool.  

It is not unusual for an old cylinder head to crack and suffer from general wear and tear. Although built to be strong and resistant to wear, the cylinder head is exposed to pressure from the process of combustion, high temperatures and vibration from the engine when it is running, all of which will eventually cause stress to this part. The cylinder head can also deteriorate as a result of corrosion over time. A leaking engine; dark smoke coming from the exhaust pipe; a strong, bad, rubbery smell  when travelling in the car; an engine that's overheating; and an engine that keeps cutting  out, could all be signs of a faulty cylinder head and could mean you need to replace this part. In some cases vehicle manufacturers only offer a bare cylinder head casting that will need all the parts assembled after purchase. Some car owners who have the mechanical know how choose to buy a bare cylinder head so they can assemble and fit it themselves, perhaps as part of a larger project to either renovate or build their own vehicle. When replacing the cylinder head it is important to fit a part that will be compatible with the make and model of your vehicle. Designed exactly for the car you drive the cylinder head bare is the ideal choice.