I checked the cylinders and they are as good as they get. Then I checked the head, these cb750s are known for weeping a little bit of oil, even when they were new. It was a bit out of tolerance, so a little was taken off and now it is perfect. The valves pulled 100% and now all it needs is new valve seals.
The surface on this head is better than factory original, thanks to better machining equipment. I think I will put this finish on all future heads even if it is within tolerance.
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