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:so302 bored out .60 over, stock heads, roller rockers, 280/240/.512 cam, solid lifters, 9:1 compression, 2:80 rear gears (i think), 3500 hughes stall speed. Douge thorley headers, 1 5/8-2 1/2 collectors borla dual exhaust 2 1/2 in/out

Ok that eveything i can think of to help give you guys an idea what im looking at. This is the first time im building a car so dont be too technical. Engines been built tranny sitting next to it all the parts ready to go in. Im at the carb stage. I have heard the name edlebrock and holley for years and just recently heard of barry grant. Not that money is no obejct, because it it. I just want to buy quality even if i gotta save alittle longer. Feel me? iIcalled barry grant (talked to Adam)and even though the guy sounded sleepy and like he didnt want to be at work he was helpful. Says because of my setup, specially the cam he puts me in a 575 might demon with mech secondaries. Sounds great so i been looking for the best deal. In doing so i have come across horror stories and great stories. Now what about holley how do select one, make some suggestions please because im not familiar with them at all. The different series that is. I know they are similar. So any advise about what to expect or save my money and go another route will be greatly appreciated. Im not raceing. ill putting around town. Or romping around town that sounds better. so i need streetability and highway drivability more than anything but the occasional smoking of the tires is to be expected
 

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Yeah, that's a decent sized cam, but with those stock heads, you won't breathe much more than 600 cfm. 625 is the absolute largest I would go with your setup, unless you plan to put bigger heads on some day, then go 650 and jet it down till you get the heads. For a street car, you probably won't go wrong with ANY major brand, as long as your cfm is close, mostly the minute differences between carbs only really help out the serious racers, otherwise, buy the one you like the looks of the most. (I know that sounds silly, but are YOU ever gonna take it apart and tweak with anything inside the carb to make it better?) if the answer is no, then all of them are about the same. They squirt fuel and suck air.
 

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lol thats funny. yeah i hear you. Barry Grant has a 575 mighty demon that they suggest for my set up. I read a post that guy was seriously dissapointed. had to go through all kinds off bs so get it tuned.
 

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honestly I think bill gave you some decent advice. I have a 650 mighty demon on my mustang and have had for several years I bought it because either the holley or the demon were recommended with my supercharger, and I had a holley before and it did not work well, (found out after I had bought the demon that there was a crack in the holley which likely explained why it was not working properly) anyway I have been very happy with my demon carb. they send a video with the carb which helps to tune it, but when I went through barry grant they sent it out tuned for my car and altitude and it worked great out of the box. I think that any of the major carbs in the 600 cfm range will work well for you. and by the same token you can have trouble with any of them as well.
 

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I had a stock 289 and I'm running a Demon Jr. 625, single feed instead of dual feed and it ran great on the 289, will be running it on the motor now that I have stroked to 333.
It's a good setup for me running an AOD. From what I've read i'll get better mileage than a double pumper and I 'may' loose a little on the top end to a double but most of my driving will be DD.
Jon
 

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:so302 bored out .60 over, stock heads, roller rockers, 280/240/.512 cam, solid lifters, 9:1 compression, 2:80 rear gears (i think), 3500 hughes stall speed. Douge thorley headers, 1 5/8-2 1/2 collectors borla dual exhaust 2 1/2 in/out

Ok that eveything i can think of to help give you guys an idea what im looking at. This is the first time im building a car so dont be too technical. Engines been built tranny sitting next to it all the parts ready to go in. Im at the carb stage. I have heard the name edlebrock and holley for years and just recently heard of barry grant. Not that money is no obejct, because it it. I just want to buy quality even if i gotta save alittle longer. Feel me? iIcalled barry grant (talked to Adam)and even though the guy sounded sleepy and like he didnt want to be at work he was helpful. Says because of my setup, specially the cam he puts me in a 575 might demon with mech secondaries. Sounds great so i been looking for the best deal. In doing so i have come across horror stories and great stories. Now what about holley how do select one, make some suggestions please because im not familiar with them at all. The different series that is. I know they are similar. So any advise about what to expect or save my money and go another route will be greatly appreciated. Im not raceing. ill putting around town. Or romping around town that sounds better. so i need streetability and highway drivability more than anything but the occasional smoking of the tires is to be expected
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You have a high stall, but only 2.8 gears ? For steet / highway maybe later you may want to upgrade to 3.40's. I seem to like those as one of the best combo's for a good launch and good for the highway. I'll give you some good advise here, as i worked on alot of the older mustangs. I don't have good experience with the holley 600 cfm (part 80457). I'd either go with an edelbrock 1406 or a Holley street avenger. If your cam produces a high duration, Barry Grant will make full use of it, awsome carbs, but pricey but you pay for what you get.
 

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Discussion Starter #7
thanks everyone. i think i have my mind set on the mighty demon. wait a few more pay checks and just do it. thanks alot...
 

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Wait a minute.... You have a lumpy cam and a 2.8 rear gear and you are going to try to run mechanical secondaries?

It is your choice but when you have problems with the engine stalling on you every time you press the accelerator to the floor from a stop give me a thought. (you will be thinking of me a lot) There are only two carbs I would recommend for that mix of parts.....

Holley Street Avenger 570 and the small Edelbrock.
The Edelbrock carb will probably be the easiest install and give you fewer problems.
Remember you won't be able to get more than $100 for the Demon when it won't run for crap on your car.

OK, I have been hard on you - you needed it. You need 3.75 gears (to 4.56) to run the mechanical secondary carb successfully on the street, even with a 3000 rpm stall. The Demon is a good carb - no doubt about that but on your application it just doesn't work.
 
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