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Once the engine passes its cold test, PBC engine builder and balance-room operator Don Henley cycles it through the balance machine, using natural gas (instead of gasoline) for fuel. This machine finds imbalances in the front and rear of the engine. Henley then places weights on the damper pulley and the flywheel to bring the imbalances into specification. The specs call for less than 0.5 ounces/inch in both the front and the rear.