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The closer the rotor points to the correct dist cap terminal, the less chance of going to the wrong terminal (crossfire) and the shorter spark means potentially more energy to the plugs.
He is getting it bang on because he can. No mech advance inside the dist. With an advance mechanism, the rotor has a range of movement around the respective terminal.
Large rotor caps have reduced the need for this to some extent (for the crossfire problem), but it's still a good idea.
Did I get that right?
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