The bike earned its nickname because of the cooling fins on its cylinder head.
cylinder head chambers modified, reshaped and polished.
Investigation revealed that the cylinder head had been improperly installed using mounting bolts that were too long.
In all situations the cylinder head and regulator are to be protected.
The oil pressure dropped to zero and the cylinder head temp went up to the peg.
British Dictionary definitions for cylinder head
the detachable metal casting that fits onto the top of a cylinder block. In an engine it contains part of the combustion chamber and in an overhead-valve four-stroke engine it houses the valves and their operating mechanisms Sometimes shortened to head