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If you charge till all the bubbles are gone AT IDLE, you are considerabally overcharged. Thats why new cars used to show bubbles at idle, when they had a sight glass. If you're going to take the riisk of charging by sight glass, make sure and do it around 2200 rpm. If you want to charge it correctly regardless of which gas you use / switched to- use guages and charge to 27/or 28 low side and 170 or 175 high side at about 1500 rpm.

Mark


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