Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Secondaries on a Edelbrock 650 Thunder
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Old 06-20-2006, 07:58 AM
onovakind67 onovakind67 is offline
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Edelbrock describes the secondary operation like this:

A mechanical secondary air velocity valve in Performer Series carbs senses air-flow according to demand and automatically regulates a smooth transition from part throttle to wide-open throttle.

These carbs have mechanical secondary throttles that should open wide when you rotate the linkage all the way.
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