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Sometimes I watch the voltage from the O2 sensor to see if its staying below the crossover. (not going into close loop). Also optimize vacuum. But mostly I lean it out until it loses power. I have not been able to melt anything, it just loses more and more power as I lean it out. The pipes are burning gray to white. Scan gage type testers wouldn't work because pulse width actually increases as the injector can't open fast enough to satisfy the fuel tables.
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