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Old 02-24-2016, 03:11 PM   #1
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CFM 500 or CFM 600 What's The Difference ?

Hi Guys (Newbie Here)

I'm having my ' 66 Mustang Covert. troubling fuel injection system taken out and replacing it with:

I don't know what CFM I should go with the carburetor ?
500 CFM or 600 CRM ?

Can you guys tell me which CFM is BEST for my car and WHY ?



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Old 02-24-2016, 04:18 PM   #2
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Depends on your engine size and application. If you have a 289 or 302 either should be fine. Difference is minor and probably in fuel efficiency and how high you redline max rpm. Use an online cfm calculator to determine which is best. For street you won't notice a difference. But don't go over what's recommended. You'll experience hard starts and rough idle.

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Old 02-24-2016, 09:12 PM   #3
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Holley would reccomend a 390 cfm, that's fine if you don't plan on tracking it but it's going to make no power above 5k, I'd do the 500 cfm but I personally don't like the eddy carbs but then again I've never spent the time to learn how to tune them id go with a Holley 570 street avenger

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Old 02-24-2016, 09:31 PM   #4
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Used to run a 650 Holly on my 65 2+2. It was a 289 with a 180 Edlebrock Hi-rise and the 289 Hypo cast iron headers. Perfect set up. Car came with a 600 Autolite Vacume secondaries 4bl. That was a good carb when she was stock.
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Old 02-25-2016, 05:32 AM   #5
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Stock engine I would stay with the 500 CFM. Even then you may have to jet it down a bit. I have seen a lot of people over the years use 600 or 750 carbs for a little while then jet them down to 400. You will be able to tell when you hit the gas hard to take off and there is a hesitation then it goes like H---. This is a sign of to much gas at one time.
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