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Your right Cab, Coomer mispoke, that will happen.

To the original question, in most cases, with the same CI, The bigger bore is the way to go.

Technically, with the same PSI combustion pressure, both equal CI engines would produce the same output if the A/F intake charge would remain the same.

But typically the heads are always shrouded by the bores with the production motors that we use for racing. Therefore, the bigger bore will always rule VS longer stroke Same CI.

It will have a lessor effect on a smaller HP motor say 500 HP and a much larger effect on say a 900 HP motor.

Dogday, and others good posts.

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i have to agree.
aside from that, in the real world nobody would build one of each with identical parts anyway, would they?