Holley Carbs
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Holley Carbs
Hi, Depends on usage. For most 2 barrel applications you wouldn't want to go bigger that 500-600 cfm. 390 cfm is about 40 cfm more than the standard 2 bbl Autolite carb. I have a 68 Cougar with a 302 and have researched this intensively. We have about 400 people on our listserv and I have listened to their recc. on this. It boils down to the above.
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Joined: Jun 1999
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Holley Carbs
Reading through these posts I noticed something... The original question was about the Holley 390 which is a 4 barrel, but the info in the other posts talk about a 2 barrel carb. I have found that using a 2 barrel carb gives me more low end power than a 4 barrel but I lose all my upper end power (past 3000 rpms). I have a 300 motor (inline 6) with a Offy Intake and after doing all the research, most Speed shops recomended a 600ish CFM 4 barrel carb instead of the 390 4 barrel . You will need to tune "down" the 600ish carb so you don't flood the little 302 (or my 300 which is bored out to 302). In my case I am using a Carter becuase of size contraints (I 2nd float bowl on a Holley won't clear the firewall in a van). Don't forget that 2 barrel carbs and 4 barrel carbs are measured differently so a 500 CFM 2 barrel carb is not the same size as a 500CFM 4 barrel carb.
Mark
Mark
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