Thread: dual 4 barrels

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Fwiw, here's the 32.

I guess it will be fun. Alot of torque and HP in a light car. Ever your down my way, would love a ride in your roadster. I made my own fuel log that looks similar to yours. As soon as the weather warm up, I'll be taking my old intake and carb off and putting on the dual 4r's. You got some great looking vehicles.

Auburn, California?

I moved to N/W Arizona summer before last.
Came from Visalia, California and know quite a few hot rod types there.

About ten years back I sold a project 39 Ford four door to an Auberry, California auto parts owner.
Auberry is near the Edison Big Creek hydro generation project.
Always wondered if he ever got it running, just about all the specialty parts for an SBC, T-350 9" car with solid axle were there.

I'm not sure where Auburn is.

Unfortunely Auburn is in the other direction like NYS. My wife and I are moving to Wyoming sometime in the future and then we could make it a shorter trip.

Not to hijack Chevy37's post here, but the subject has tweaked my memories in these last few posts.

Hey C9x, you're talkin' about my past, here. I was employed by SCE for over 35 years and worked all over the service territory, and when I retired, we moved to a mountainside some 15 miles northeast from Auburn - sort of between Auburn, Grass Valley, and Colfax. The cold winters finally caused too much concern for my physical well being (wrecked ankles and icy ice don't get along too well), and we sought out warmer climes - we sure did get "warmer", in spades with the move to Las Vegas, although, the other morning it was 28 degrees when I got up at 0600. Whereabouts in N/W AZ are you?


By the way, Chevy37, I, too, think you're on the right track - some good advice here, as always seems to be the case; dual quads have their own special appeal.

Thanks Rrumbler. 28 in Vegas. Damn that's colder than upstate NY

Originally posted by Rrumbler
Not to hijack Chevy37's post here, but the subject has tweaked my memories in these last few posts.

Hey C9x, you're talkin' about my past, here. I was employed by SCE for over 35 years and worked all over the service territory, and when I retired, we moved to a mountainside some 15 miles northeast from Auburn - sort of between Auburn, Grass Valley, and Colfax. The cold winters finally caused too much concern for my physical well being (wrecked ankles and icy ice don't get along too well), and we sought out warmer climes - we sure did get "warmer", in spades with the move to Las Vegas, although, the other morning it was 28 degrees when I got up at 0600. Whereabouts in N/W AZ are you?

34 years as an operator at:
Saugus Sub,
Colton Sub,
Saugus Sub,
Pardee Sub,
Rector Sub.

Kingman, Arizona.
3300' altitude, temps are usually 10-15 degrees less than at Laughlin on the river and about the same as compared to Las Vegas.

14 degrees here at dawn last Friday . . . and 26 degrees inside the garage.

I gots wrecked ankles as well, but not too bad.
I just get reminded of all those trips over the handlebars of a dirt bike when the weather is cold.

My daughter lives in North Las Vegas and we go there now and then and go to Laughlin fairly often.
Cheap entertainment at either place if'n you don't gamble.

Originally posted by chevy 37
Unfortunely Auburn is in the other direction like NYS. My wife and I are moving to Wyoming sometime in the future and then we could make it a shorter trip.

My granddaughter lives in Wyoming, close to Casper.
1 degree above a few days back.

She's learning that Kingman weather was nothing compared to the weather they have there....

Yea the weather can be bad in Wyoming, but were thinking of moving to Cody were it's not as cold and their total snowfall is less than 20". We were out there this October and it was in the 80's

TO un-hijack the thread for a moment I'd recommend the Holley 4160-series 390 cfm carbs, P/N 8007. I run two of them with a straight linkage and stock jetting on a 5.0L H.O. and it runs killer. Good luck, man -- two fours is a beautiful thing! If you run the dual 500's, keep us updated.

Ever had any trouble synchronizing your holly 390's. I heard they were a pain in the ass to calibrate.

So . . . just what does happen if the carbs aren't perfectly synchronized?

Originally posted by chevy 37
Ever had any trouble synchronizing your holly 390's. I heard they were a pain in the ass to calibrate.

Not that I'm aware of. I rebuilt them completely before I put them in; that might have helped. But they haven't given me any trouble and all I've done to "tune" them is adjust the slider on my homemade linkage and tweak the chokes a bit.

The linkage:



They ran fine until this new build, when I had all kinds of vacuum leak problems; I ended up replacing the #!%%&ing power valves a few times while I was chasing the leak. I'm going to tear them down again this winter and put the blowout protection thingies in. Stupid Holleys. :cry:

I think that tuning / balancing dual carbs may be more of an issue when you're egregiously overcarbed; I was told numerous times that I had to be meticulous about tuning them but they literally swapped right in on both the old 302 and the new 5.0, tunnel ram and all -- turned the key and it ran killer. Minus the vacuum leaks, mind you.

I know one other person who ran dual 390's and he had the same experience. Dual 390's are obviously smaller than the 850 Street Compensator or whatever monster quad is the rage these days. I know a guy who told me to scrap the idea of running a dual-quad tunnel ram because he once had dual 750's on a SBC and, I quote, "It was impossible to tune. It never ran right."

I'm glad you didn't really have any problems with yout Holly's. I've never run dual quads, but quite a few tri carb set up's and all were hard to get them properly tuned. I'm going to make my own slider system where I'll use just my front 4 barrel and when I want WOT I'll have the second carb cut in only part way. Hopefully that should work out OK.

Originally posted by chevy 37
I'm glad you didn't really have any problems with yout Holly's. I've never run dual quads, but quite a few tri carb set up's and all were hard to get them properly tuned. I'm going to make my own slider system where I'll use just my front 4 barrel and when I want WOT I'll have the second carb cut in only part way. Hopefully that should work out OK.

I suggest that fuel distribution will be a little better if you use the rear carb as the primary and pull the front carb in later.