Here is a post that answers the question well:
"Without grooves, the combustion is incomplete and unburned fuel
remains in the cylinder. This unburned fuel is still expanding during
the exhaust stroke; with the engine idling at the end of the exhaust
stroke the expanding unburned gases flow past the intake valve into the
intake manifold causing poor idle.
With the grooved cylinder heads combustion is more complete leaving
little unburned fuel behind, more of the fuel is used to generate power
and less is used to generate heat. (That’s also why the engines run
cooler). With the modified heads little or no unburned fuel
remains during the exhaust stroke. With less unburned fuel to expand
during the overlap period the gasses flowing past the intake valve are
reduced resulting in improved idle quality."
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