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Old 01-11-2013, 03:27 PM
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You can get a pretty good idea by flipping the carb over and measuring the primary and secondary throttle bores at the bottom of the carb.
Here's a chart showing CFM in the 3rd column, primary throttle bore size in the 8th column and secondary throttle bore size in the 9th column.....
Holley Information Table1 2 - Holdenpaedia
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