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12G206 and 12G295s are the "open chamber heads" which are not much different than a full race prepared 948 head, though without the potential drawbacks like expense and unreliability normally associated with full race heads.
I would expect a lot more than 6 hp if you would also use the HS2 carbs insted of the original "HS1" carbs.
BTW, they bolt directly onto a stock 948 without overbore.
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