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Old 04-06-2004, 09:08 PM
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575 speed demon

Whats goin on, quick question for all of you demon users.I have a warm sbc 327, in my 68 camaro, now im running a 600 edelbrock that has finally taken a s**t on me, I called barry grant today and the said for my app. the best carb would be a 575 speed demon vac sec and elec choke, For the best overall performance. Im running a 600 now, does the 575 seem right to down size 25 cfm.What do you think of that carb. thanks....
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Old 04-06-2004, 09:14 PM
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the guys at BG know what there doing, the 575 would likely serve you well, since Demons are under rated flow wise.
I have a road demon Jr 625 on my 350 and I love it, once you get it tuned in it`s good to go, nice and throttle responsive. but be aware, if you go Demon you can`t do as you would with most any other carb, bolt it on turn a few screws and go, Demons are very precise, you have to read the instructions and read them very carefully to set the carb up right or it won`t perform properly, but once it`s set it`s set. leave it and enjoy.
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Old 04-06-2004, 09:16 PM
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Why not rebuild the Edelbrock?
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Old 04-06-2004, 09:20 PM
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The edelbrock has been a great carb, I was just looking for a little more of a performance carb barry grant tech said that compared to the edelbrock i would see a bit more performance, Granted the are in the business to sell carbs.
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Old 04-06-2004, 09:23 PM
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Don't know anything about these Demon carbs, guess I'm old school, but the Edelbrock is my choice for my 350s.
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Old 04-07-2004, 06:26 AM
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Its personal opinion, I dont care for Edelbrock carbs anymore. the BG575 shuold serve you well up to about 5500 RPMs in your 327. John
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Old 04-07-2004, 09:58 AM
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Having run Holley, Edelbrock, and Demon in a street application, I would HIGHLY reccomend the Demon...It is a more precise animal in all respects right out of the box...
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Old 04-09-2004, 04:22 AM
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Thanks for all the replys, but what if im running a little over 6000 rpms....
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Old 04-09-2004, 08:26 AM
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I don't see why the Demon wouldn't be good over 6k rpm's. I'm running a modified Speed Demon 750 on my 383 and we are regularly shifting out at 7200 rpm's. I know that sounds high for a 383, but it's a 6" rod motor that just begs to be wound up that high.

I would expect someone with a little short stroke 327 to be winding it up a good bit past 6k rpm's.
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Old 04-09-2004, 08:29 AM
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If your taking it to 6K RPMs itll be fine. If you plan to run over 6K Id go with a 625 CFM Demon. John
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Old 04-09-2004, 09:47 AM
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Thanks for the help, I will try the 575, I wanted to go 650 speed demon but was told that it is to much given the carbs flow characteristics, I guess Im just in the mind set that the 575 has no room for advancement, don't want to be held back by a 400.00 carb.
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Old 04-09-2004, 02:18 PM
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Gmachine

Get a hold of Don at FBO systems and ask what he would recommend.

He will also perform a baseline calibration according to the performance mods you have done if you purchase it from him. He does not charge anymore then anyone else for the carb and you will get a person that tunes them day in and day out setting it up.

Here is Don's link.
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Old 04-09-2004, 02:20 PM
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BG's carbs flow alot more than they advertise, guy i know had a 650 and it flowed 715

-Eric
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