Originally posted by ForcedFirebird
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if you compare a 3L engine 86x85.8mm vs 84x89.6mm then the large bore option should make more hp due to reduce shrouding and/or being able to fit larger valves which helps airflow and hp potential, if none of those offer meaningful benefit / are an issue or implemented on the particular engine in question then the only benefit in general is the reduced friction due to shorter stroke.
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