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Too much overlap leads to reversion, lazy throttle response, low dynamic compression, poor idle. Too little overlap sacrifices mid range torque and increases the sensitivity to detonation.
more overlap can improve throttle response, and increases dynamic compression if the overlap increase was realized by way of lsa reduction. the old man always (always) told me, " it's all about when the intake valve closes." lsa increase will flatten the power band and reduce dynamic c/r, lowering cylinder pressure, and making the engine more resistant to detonation (in an appropriate combination).
for what is the good life if not doing things thoughtfully?
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