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The distance between the valve face and the head of the valve is called the margin.
Yes. The head gasket forms the seal between the engine block and the head(s). The valve cover gasket seals the gap between the valve cover and the valve train it is covering.
The year, make and engine info would be helpful.
No the valve seals are between the cam and the head, under the valve spring
the difference between a head and a skull is that a head has tissue and a skull is all bone
A burka is a full-body covering garment that includes a mesh screen over the eyes, worn by some Muslim women. A hijab is a headscarf that covers the hair and neck, leaving the face visible. Both are worn by Muslim women for modesty reasons, but the burka covers the entire body while the hijab covers the head and neck.
Most other muscles are larger and all are located below the human head.
Mainly, the difference is that in an overhead cam engine, the camshaft is mounted on the head of the engine, and the valves are still overhead, in an overhead valve engine (sometimes called a "pushrod motor"), the camshaft is in the crankcase.
A head scan looks primarily at the brain and a sinus scan looks only at the sinuses in the face region.
Gasket that goes between head and valve cover to prevent leaks
No
It is similar to difference between Head and Hair !