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1974 911 going to 911s cams

Engine

Vehicle Information: Model: 911-92; Year: 1974; Body Type: Coupe; Total Mileage: 62,000;

I have noticed that the 911-92 has 150 hp and the 911S has 175, so far l have not been able to find how that is done. I can tell by the spec book that the cams are different. Can l gain some of those 25 horses by going to 911S cams? I would like to stay with the stock fuel injection system. I am trying to keep the engine stock but a few more hores would be fun.

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