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WBrianS 05-17-2004 08:42 AM

Holley carb model number?
I got a donor motor (a GM 427) w/ an old Holley carb on it.
I was curious what the cfm's on this carb are and can't seem to come up with any information on it.
It says it's a model 4773-1.

Anyone know?


wheel-7 05-17-2004 10:13 AM

Holley Carb
You can go to and the information should be there. Holley also has a tech support line that can help you with any question you have on the carb.
hope this helps

ratlover 05-17-2004 08:54 PM

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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