Editing Hot rodding the HEI distributor (section)
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===Effect of initial timing on carb tuning=== What happens sometimes is the initial timing is too low, causing the primary butterflies to be opened so far to get the engine to idle that the engine is not running on the idle circuit; instead it is running mostly on the transition slots. If this is the case, the engine will idle high when out of gear and then the idle speed will drop down once it's put in gear, and the off-idle response will be poor. This can be magnified by not having enough torque converter stall rpm and to a lesser extent not enough rear gear ratio.
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