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I noticed a big difference when I put SC cams on my 76, a generally stronger pull at all RPMs. My guess is your CAM timing isn't set correctly. From what I've read you won't see much difference between the late style SC and 964 cams (on that motor anyway), so I think its something else. Do you know what your CAMS are timed at? Who ground them?
Jesse
76 911 S
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