ProECU is right, Honda actually put casting marks into the head to promote swirl upon cylinder entry. Better fuel/air mix = bigger bang.
Honing a sprint car head may work, cause they rarely come of full throttle, normally with ITB's and camshafts optimised for the honing process.
Inlet manifolds, turbo compressors etc are good for the 'honing process' but heads still need the human element to get them right.
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