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It could be that you've simply got a good tight engine, and it's had the head gasket replaced before. That would mean that the head was planed by a machine shop. They could have taken off enough to increase the compression.
IF you're not having any problems with pinging, I wouldn't worry about it. IF you are, I recommend a fuel system cleaner, and there's only one that's any good: Techron. It is supposed to help remove deposits all through the system including the valves.
Good luck with it!
Rob Bareiss, New London CT
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