We will often see a roller cam ordered with a "B" suffix code after the lobe number. With the code they can, but not always, alter the rated duration. Typically with 1-2 degree less duration.
The duration at .050" and .200" remain the same.
Also sometimes a "B' suffix code can, but not always, add an additional 0.001" to the lobe lift.
Different journal diameters can alter the rated duration.
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/
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