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Old 01-21-2005, 09:14 AM
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dual carb setup for BBC

Hey guys I wanted to get some opinions on my intake setup before I make a final decision. Here is my engine combo.
454 2 blt + .030
SP 10.5:1 hyper pistons
SCAT9000 crank
3/8 rods polished , resized and new ARP bolts
All balanced.
CC Xtreme 292 solid
Brodix Race Rite 110cc aluminum heads with CNC'ed ports.
Muncie M2o wide ratio 4 speed
3:70 rear gear.

I cannot decide on whether to go with a Edelbrock dual quad low rise settup with twin Edel 600 AVS carbs.
OR
Edelbrock Performer RPM Air Gap with a BG 800 mech sec.

Would like to here some pros and cons for both. Also who has settup a low profile dual quad setup and how easy\hard is it?

Thanks in advance for the comments and advice.

BlackRat

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Old 01-21-2005, 09:32 AM
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I think you might get different views, I would stick with a single quad for ease of tuneability.
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Old 01-21-2005, 09:33 AM
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You would have more fun with a single plane intake, Vic Jr. style on this ride with the 4 speed. If you go BG go with a 750 Demon, BG's flow more then what the rating is.

Chris
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Old 01-21-2005, 09:43 AM
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Dual quads

I've had dual Carter's on a low rise intake on a Pontiac HO 400 for years. I used to have a 750 Holley on a dual plane and I have to admit the 750 responded better off the line but I like the dual quad look. When I got into it from about half throttle the duals performed better.
I didn't run progressive linkage, both run equal with Mechanical secondaries. Not economical but it was a cruiser and hot rod. I've seen a couple of types of progressive linkages at shows recently but don't have a source. I'd consider one for myself now.

I also saw what I thought were huge mistakes by people at the shows with dual quads. They ran a single return spring on the linkage, a major no-no IMO.
Run dual springs (inner/outer) on each carb so no matter what happens the carbs will close. A carb stuck wide open is a scary ride and can blow the engine real quick.

Good luck.
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Old 01-21-2005, 09:56 AM
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Show pic

Here's a pic of one from the show. Not a bad looking set up. He does have two springs but still only one per carb.
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Old 01-21-2005, 11:06 AM
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A 750 carburetor would be the best choice if you decide to go single 4bl. The problem with 2x4 setups is you have to go to one extreme or the other. Either extremely small on the intake, and carburetor sizing to get the drivability OK, or go with the proper size to make more HP in the upper RPM range, and you loose the low RPM throttle response.
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Old 01-21-2005, 07:09 PM
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I ran dual 625 Carter AFB's on a BBC that was set up very similar to yours. I never had any trouble tuning them (just had to put lighter springs in the idle circuits) and response was excellent. I didn't run a progressive linkage so it wasn't exactly what you would call an economic setup. I will say that this setup in my pro-street car was fast enough to scare the he11 out of me on more than one occasion.

Centerline
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Old 01-21-2005, 07:13 PM
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I have the same setup as Centerline, but progressive linkage. Runs great, has for the last 13 years. Gets about 13 MPG. I have an electric choke on the primary carb, it will start and run at idle in sub zero temps.
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