Need to pick up a carb for the 454 soon and was wondering if anyone has experiance with the Barry Grand Speed Demon 750cfm? I've used Edelbrock Performer series carbs on about 4 different projects and have had nothing but good things to say about them. Are the Barry Grant carbs worth the extra $150?

BTW, this will be a for a cruiser car...maybe a few track runs but mostly just a driver.

When my 506 was dynoed with the 750 Performer it was starved for cfms, they changed it to a Barry Grant Demon, I think like 900 cfm with a few other minor changes and the engine picked up 100 horsepower. Haven't driven it yet, but heard many good things about them.

I had a holley on my 400 sbc then put a 750 race demon on it (out of the box)it was well worth the money. to bad it didn't live long enough for the dyno :mad: (drunk driver totaled it)

Originally posted by aubreyt213:
When my 506 was dynoed with the 750 Performer it was starved for cfms, they changed it to a Barry Grant Demon, I think like 900 cfm with a few other minor changes and the engine picked up 100 horsepower. Haven't driven it yet, but heard many good things about them. Yeah but a 900cfm Performer (if they made one) would have probably gained 100 hp too right?

Originally posted by Got_CID?:
</font><blockquote>quote:</font><hr />Originally posted by aubreyt213:
When my 506 was dynoed with the 750 Performer it was starved for cfms, they changed it to a Barry Grant Demon, I think like 900 cfm with a few other minor changes and the engine picked up 100 horsepower. Haven't driven it yet, but heard many good things about them. Yeah but a 900cfm Performer (if they made one) would have probably gained 100 hp too right? </font>[/QUOTE]Maybe, I think my problem was not close to enough cfms, but I posted about the Barry Grant carb as soon as I heard thats what they changed the carb to and everyone said they're good, alot like holleys and are real easy to tune.

The BG/Demons in my opinion are okay, but hard to get to be stable in all weather conditions. I have one on my 69 Camaro and like the looks and throttle response with the vacuum secondaries, but still tuning for summer, spring and winter temps...mainly idle issues. It does not meter as well for gas milage either in my experience...just as Holleys don't. It's the inherent design.

The Edelbrocks are inherently more stable and much easier to tune as well as metering champs in my opinion. And, no seals below the gas line! A biggy in my opinion and the idle is right on no matter what the situation is.

CFMS are CFMs no matter what carb is delivering them. The myth that Holleys are better than others for performance is just that. Holley 750s pass a smiggin more cfms (about 780) than the Edelbrock 750s (about 760)and that's the reason they are better for WOT situations where the engine can use the extra flow. If your engine only requires 720 CFMs and you put a Demon, Holley or Edelbrock 750 on, you will NOT see one ioda of difference in the performance as far as peak hp is concerned.

Contrary to popular believe, a too large of carb will degrade throttle response, so bigger is not better in these cases. Do your home work and select the best CFMs that match your application.

Love my 750 Speed Demon, They test them and run great right out of the box.

What type of manifold are you using? If you are using a spread bore manifold, and this is going to be mainly a "cruiser", why not try a Quadrajet.

You can have JET Performance tune a carb (with a Stage 2 or Stage 3 settings) for about $250 to $350 if you supply the carb. (I think?)

http://www.jetchip.com/

I guess theoretically if two carburetors are suppose flow the same cfm, there should not be any HP difference or torque gain. What you will find out that from people with real life experiences, is that, carburetors rated at the same cfm will have different performances on different cars. I too have ran edelbrock carburetors but recently switched over to demon 650, and hopefully soon a demon 750. Demon carburetor are a very nice carburetors. You may hear people having problems with them, IE tunning and others, and then you will hear people rejoycing about their performance gain. I favor the Demon and I like there design and tuneability,(Spelling)!

Its going on a 454HO crate motor with a dual plane intake....I think I'm right on the 750cfm being enough. I don't think I need anything over that.

The Edelbrocks (I assume we're talking the AFBs here) are really easy to tune if you need to. I used an 800cfm for my blown 383 and it ran great (may have been too much?). The AFB design is real simple but doesn't offer the infinite tuneability that a BG or Holley design has. If you want simple and don't want to have to mess around with a carb then get the Edelbrock. But if you want the most power potential I think the BG would be the way to go. However, I'm sure you will get varied opinions on both.
Good Luck

I'm running the Edelbrock 800 on my 468, and it works great.