Edelbrock 600 carb
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Senior User
Joined: Apr 2005
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From: Murrieta, CA
Edelbrock 600 carb
This carb seems to be flat from 2000 rpm on up. I'm thinking of the barry grant 850 vac secondaries. Does anyone have any experience with this carb?
390, 60 over, erson cam, (.55I, .55E, 280,280),non ported edel heads, fpa headers, 9.7 cr, edel rpm intake., 3.25 gears, c6.
390, 60 over, erson cam, (.55I, .55E, 280,280),non ported edel heads, fpa headers, 9.7 cr, edel rpm intake., 3.25 gears, c6.
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Senior User
Joined: Apr 2005
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From: Murrieta, CA
check this out. I know it's a Mopar site but It's a similar size engine.
http://www.moparts.com/Tech/Archive/bb/25.html
http://www.moparts.com/Tech/Archive/bb/25.html
Posting Guru
Joined: Jul 2003
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From: Colville, Washington
Here's Holley's carb cfm formula:CFM=CIDxmax RPM/3456. That assumes 100% volumetric efficiency(not likely with a street motor) so you need to multiply your result by 85% to 95% depending on the overall efficiency of the engine.85% is a safe spot for a mildly hopped up motor. So...(6000rpm redline)at 100% VE=698cfm; 90%VE=628cfm
FWIW on a similar 390 I had, I used a 650 Holley double pumper that worked very well. The present 428 needed more, so I am using a 750 cfm Holley vac sec.
FWIW on a similar 390 I had, I used a 650 Holley double pumper that worked very well. The present 428 needed more, so I am using a 750 cfm Holley vac sec.
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From: Albuquerque
If you want a Demon, then you should probably go with the 650(preferred) or 750 "Speed" Demon...
http://www.barrygrant.com/demon/default.aspx?page=10
http://www.barrygrant.com/demon/default.aspx?page=10
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I have a 650 demon on my 390. Runs good on the street. But when I get in the mountains it gets a little sluggish on me. I am considering going with a 600 cfm.
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From: Albuquerque
Originally Posted by stegmst
I have a 650 demon on my 390. Runs good on the street. But when I get in the mountains it gets a little sluggish on me. I am considering going with a 600 cfm.
Do you have a "Speed" Demon? According to the Barry Grant website, our trucks should be using the "Road" series Demon for daily driving, towing, etc. Unless you drag...the "speed" Demon might need to be de-tuned for your application...which could be part of it...
I've been looking into the "Road" "Trucker" Demon in a 625cfm. Still undecided...
--Anyone--
Why would dropping cfm from 650 to 600 improve the sluggishness stegmst is having? Does it have to do with the altitude and the thin air?
Thanks!
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