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In the past engines were seldom balanced beyond what the manufacturer had all ready done. A typical re-build using the the same parts (crank, con rods, pistons etc) would be cleaned up brought to within specs and bolted back in.
Parts were marked so as to go back in exactly the same place.
Building a new engine, a block here, con rods from over there, custom pistons etc will require balancing.
Ernie
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