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Intake valves are are almost always larger than exhaust valves . The exception may be in a low performance small engine where sometimes both the intake and exhaust valves are the same size.

The intake phase of the 4 stroke cycle relies on engine vacuum produced during the piston down stroke to draw the fuel / air mixture into the cylinder.

Vacuum (as opposed to pressure) is a relatively weak force; therefore a larger opening (larger intake valve size) must be provided in order that sufficient quantities of fuel and air enter the cylinder - for the engine to run.

Removing the exhaust gasses is a much easier task - due to the pressure created by the upstroke of the piston.

Because the pressure created by the piston is a much stronger force (than the vacuum the piston created during the intake stroke), the exhaust gasses can escape (they are actually pushed out) through a much smaller opening, past the exhaust valve.
The intake valve is bigger.

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Q: Is the exhaust valve smaller or bigger than the intake valve?
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