Throttle body fuel injection systems sort of work how carburetors did, but without the carburetor. Instead of each cylinder getting its own fuel injector, there’s only one fuel injector that goes to a throttle body. The fuel mixes with air in the throttle body and then is dispersed to the cylinders via the intake valves.
The valvetrain is the mechanical system that’s mounted to the cylinder head that controls the operation of the valves. The valve train consists of valves, rocker arms, pushrods, and lifters.
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