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Old 02-15-2005, 07:06 PM
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Holley Avenger 670

What do they really flow?
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Old 02-15-2005, 07:11 PM
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670? I have one, but have never questioned what it actually flows...why?

Vince
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Old 02-15-2005, 07:19 PM
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Actually, a lot of Holleys are rated differently than their numbers say.

My 750 CFM 4010 flows more than the 750 CFM 4779.

My 4609 is rated at 730 CFMs, but if you look at the venturi size and boosters used it should be rated at around 780+.
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Old 02-15-2005, 11:09 PM
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are you thinking about getting one or just curious about what yours actually flows?? I have no idea how much they actually flow. I do know that swapping from an Edelbrock to the 670 Avenger on my sister's 350 camaro made a night/day difference, and they're SOOOOOO easy to setup and fine tune.
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Old 02-19-2005, 02:57 PM
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A friend of mine has a 383 with a 230o dur. cam. He bought a 670. I think it is going to be too small for his engine.

I checked the Holley site and they don't have the Avengers listed in their carb list. I can't find throttle bore dimensions, jetting, etc.
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Old 02-19-2005, 04:32 PM
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The advertised numbers are just that, advertised numbers. I don't give much thought to how many CFM a carb will flow. I only care if my engine will show 0"hg vacuum at peak rpm. Then I know it's properly sized for my engine.

As far as venturi size goes, it's flow rate is relative to venturi shape from the entrance to the exit along with the booster type.

Stick a bunch of them on a flow bench and see what they flow with constant vacuum applied. That's the only way to know for sure.

Larry
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Old 02-19-2005, 04:42 PM
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The only way I find out for sure with my carbs is to run each one for a couple months. In that time I adjust everything one by one. Trial and error.

I have been through about 8 carbs on this engine.
All Holleys
3310-4
3310-1
4776-2
4777-1
4778-2
4779-3
4609-1
84013-2 (4010 750 CFM mechanical secondary)

So far the engine likes the 4010 the best. The 4609 came in second.
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