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i looked it up but the closest i could find is either 4776 which 600 cfm or 4778 which is 700 cfm (more likely) were the numbers obscure? both of these are mech sec carbs. it seems that the lower the last digit, the smaller the cfm. the 4778 has 1 5/16 primaries and the 4779 has 1 3/8" primaries. I am quoting out of abook on holley carbs by dave emanuel.
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