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Base circle is all relative to the journal size and the lift.... a SBC Journal is 1.868 while a LS is 2.165" (55mm)
Say on each cam you have .350" lobe lift, the lobe cannot be larger than the journal of the cam or it will not fit in a V8 block. The easy way to estimate the max base circle size is: ((Journal Size/2)-Lobe Lift)*2=Max Base Circle Size
LS = ((2.165/2)-.350)*2= 1.465"
SBC = ((1.868/2)-.350)*2 = 1.168"
So almost .300" different so David's guess of around a 1/4" is pretty dam close.
Bret
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