Cylinder Head

Why aren't injectors placed in the cylinder head in petrol engines?

They use injectors in the cylinder head in diesel engines , why not in petrol engines.

This is often referred to as direct injection.
It can be used to reduce emissions and provide an ultra lean burn engine for better efficiency.
The 1955 Mercedes-Benz 300SL was the first sports car to use direct fuel injection. Many WW ll aircraft used direct injection. Since then, several automobile manufacturers have introduced direct injected gasoline engines.
The down side seems to be cost - both the cost of research and development along with the required high pressure pump and computerized injection timing.
The three way catalytic converters, for instance, are a much more cost effective way to meet present emission standards.
However, given the significant advantages of direct injection and the technological gains in computerized engine controls, I suspect we will be seeing a lot more direct injected engines in the near future.

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Briggs Stratton 16hp Vanguard Cylinder Heads pushrods tappets covers
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Briggs and Stratton engine Used 809186 cylinder head assembly 2 18 hp vanguard
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John Deere 400 garden tractor Kohler K532 engine cylinder heads right and left
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698210 Cylinder Head Gasket For Briggs  Stratton 692554 273489
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CYLINDER HEAD KIT FOR HONDA GX340 11HP ROCKERS PUSH RODS GASKET SPRINGS VALVES
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