Lead has nothing to do with the shape of the blade which is referred to as the saw. Lead is the angle that the saw "leads" into the log or the cant. It is set by adjusting the saw mandrel so the the front of the saw is closer to the log/cant than the back side of the saw. On a 56" saw the lead is in the neighborhood of 1/32" to 1/16". The smaller the saw, the less the lead and vice versa.
The shape of the saw is achieved by "hammering" which puts tension in the saw. Saws are hammered for the rpm they are operated at. When properly hammered the saw will have a very slight dish to it which can hardly be seen. When the saw is up to operating rpm it will "stand up" straight.
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