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[QUOTE="JMick, post: 4242767, member: 6467"]
it goes air box -> air filter -> air intake tube -> throttle body -> intake manifold -> head(s) -> block

the combustion chamber is in the heads and the heads are open to the block where the piston moves up and down compressing the air, while the spark occurs in the combustion chamber of the head and the fuel injectors dump fuel either: into the bottom of the intake manifold (port injection) or directly into the cylinder (direct injection).

with port injection, essentially what happens is that the fuel is dumped into the into manifold where it mixes with the air coming into the manifold. but it doesn't combust there - it gets sucked down into the cylinders (what you're calling the block) and then with the spark from the spark plugs, combusts as the piston compresses the air. This is what they call "timing."

any time they are setting your timing, they're setting when the piston is at the upmost position to account for when the burn happens

direct injection creates the mixture within the cylinder and is why it's more efficient.
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