Overlap means that both the intake and exhaust valves are open at the same time. If a cam has overlap it means that it will develop power in a higher rpm range depending upon how much the overlap is. The overlap for the "B" is less than 4 degrees whereas the "e" is 0. The more the overlap the more power in a higher rpm range and the less streetability.
If you can get a copy of October 1999 issue of 5.0 mag. there is a great article on page 69.
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