Many People, including myself, like a carbed engine that senses what the engine actually wants for airflow and gives it just that much.
I have a couple of 850 Vacuum Secondary carbs that are a exceptional on a road vehicle.
Same deal applies with the 6-Pack Vacuum Carbs except that they can support more airflow thru a larger engine.
Simple Math: Center Carb airflow = 355 cfm @ 3" Hg test pressure. To get to 4 BBL test pressure flow multiply the 2 BBL cfm by .707 or
355 x .707 = 250 cfm (4 BBL Rating).
Same deal for the end carbs:
500 CFM x .707 = 353 cfm for each carb and two carbs so 707 total cfm for the 2 end carbs.
So 707 cfm plus 250 cfm = 957 cfm (same as our 3-BBL Holley carb) but a lot "Cooler" looking package. Both set-ups should run about the same times on the track (if dialed in properly) as they are both Vacuum set-ups and they have 100 more REAL CFM vs the Corvette 850 CFM Vacuum Carb. Holley did stuff for a Reason.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
Last edited by Tom Vaught; 12-20-2017 at 01:45 PM.
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