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Old 10-10-2012, 11:25 PM
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The Summit carb has several improvements that make it more tunable- like a separate replaceable accelerator pump shooter and removable bleeds. The Holley version had no way of changing the shooter size except to drill them out or replace the entire cluster at about $25 a pop (1992 price).

The Summit also has all the secondary vacuum cover screws accessible; the Holley had one screw hidden, making it harder than it should be to work w/the vacuum secondary spring, check ball, or diaphragm.
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