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3x2s vs 2x4s

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Old Jul 15, 2011 | 09:56 AM
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Default 3x2s vs 2x4s

Anyone know why Chevys BB Corvette used three duces instead of duel fours. When the first BB 427 hit the streets a guy here on Long Island used to drive around with the hood off his new Corvette with duel fours sitting on top. Was it a faster and better set up?
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Old Jul 15, 2011 | 10:36 AM
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What I want to know is why they fooled with the 3X2's anyway.

A single four barrel will run as well and/or better than either the 3X2 or the 2X4 on the street.

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Old Jul 15, 2011 | 10:54 AM
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Originally Posted by MikeM
What I want to know is why they fooled with the 3X2's anyway.

A single four barrel will run as well and/or better than either the 3X2 or the 2X4 on the street.

......but if i were to go multiple carbs, it would be dual quads, i love to hear them "ring"

after all, the flat head guys were running multiple deuces before the first 4 barrel was conceived
i never did understand the mystique behind the 3x2 set ups or their popularity......jmo.....
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Old Jul 15, 2011 | 11:05 AM
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It's the only way to fly! It's a six barrel!

Last edited by babbah; Jul 15, 2011 at 11:07 AM.
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Old Jul 15, 2011 | 11:07 AM
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They look cool. I am sure marketing had as much to with it as the engineering dept.

Doug
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Old Jul 15, 2011 | 11:10 AM
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Originally Posted by AZDoug
They look cool. I am sure marketing had as much to with it as the engineering dept.

Doug
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Old Jul 15, 2011 | 11:25 AM
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Originally Posted by midyearvette
: "ring"
I believe "drink" is the word.
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Old Jul 15, 2011 | 11:26 AM
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Originally Posted by babbah
It's the only way to fly! It's a six barrel!
how about an 8 barrel?
with progressive linkage and 2x4"s.....

oh yeah, and one less carb body
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Old Jul 15, 2011 | 11:47 AM
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Didn't Holley actually make a 3 barrel carb for a short time back in the 60's or 70's?
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Old Jul 15, 2011 | 11:48 AM
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Originally Posted by MikeM
I believe "drink" is the word.
At least that is what the Beach Boys used in their SHUTDOWN song...."pedal's to the floor, hear his dual quads drink"

It is an awesome sound on a well tuned engine....you almost swear you can see the hood buckle in

Larry
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Old Jul 15, 2011 | 11:54 AM
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Originally Posted by builder
Didn't Holley actually make a 3 barrel carb for a short time back in the 60's or 70's?
Yes they did. It was a BIG four barrel, with the secondary throttle plates siamesed together into a single plate.

It was a "bit oversized" for street use. CFM of around 1050 or so. Created an instant bog for most street cars that used it. But it had "bragging rights"

Larry
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Old Jul 15, 2011 | 12:45 PM
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Originally Posted by midyearvette
how about an 8 barrel?
with progressive linkage and 2x4"s.....

oh yeah, and one less carb body
No Thanks!
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Old Jul 15, 2011 | 01:33 PM
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Originally Posted by Powershift
But it had "bragging rights"

Larry

That's about all it had. My brother and one of his buddies used one on a AMX with a 390. Put out a lot of power but they could never keep it in tune.
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Old Jul 15, 2011 | 03:56 PM
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Originally Posted by ps374
Anyone know why Chevys BB Corvette used three duces instead of duel fours. When the first BB 427 hit the streets a guy here on Long Island used to drive around with the hood off his new Corvette with duel fours sitting on top. Was it a faster and better set up?
because Pontiac had a three duces on there GTO and chevy could not let that happen
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Old Jul 15, 2011 | 04:15 PM
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Originally Posted by Powershift
Yes they did. It was a BIG four barrel, with the secondary throttle plates siamesed together into a single plate.

It was a "bit oversized" for street use. CFM of around 1050 or so. Created an instant bog for most street cars that used it. But it had "bragging rights"

Larry
Larry-

Back in the day, a friend of mine had a 375 hp Nova, 4 speed car with either 3.36 or 3.08 gears. His wife bi****d and moaned about how hot it was in the car, so on the same weekend, he put a Holley 950 cfm 3 barrell, he put air conditioning on it. I bet him I could outrun him on foot for 100 feet (and won). What a POS those carbs were!
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Old Jul 15, 2011 | 04:18 PM
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GM offered both a tri power and dual quads at the same time.....and I did use a 3 barrel Holley on a L88 which was a 950 CFM carb....worked fine....
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Old Jul 15, 2011 | 04:32 PM
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Originally Posted by Nowhere Man
because Pontiac had a three duces on there GTO and chevy could not let that happen
Buick offered 2X4's on their mid '60's engines.
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Old Jul 15, 2011 | 04:36 PM
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Originally Posted by Powershift
Yes they did. It was a BIG four barrel, with the secondary throttle plates siamesed together into a single plate.

It was a "bit oversized" for street use. CFM of around 1050 or so. Created an instant bog for most street cars that used it. But it had "bragging rights"

Larry
The Holley three barrel was a 950 CFM NASCAR carburetor that was introduced in the mid 60s. I have one sitting twenty feet away from me. The diaghrapm to control the secondaries is as big as your fist.
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Old Jul 15, 2011 | 04:36 PM
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I was told that the original reason for the dual 4 bbl and three dues
was the size of the 50's carbs. The 4 bbl of the day were only around 350 cfm.
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Old Jul 15, 2011 | 04:36 PM
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Originally Posted by MikeM
Buick offered 2X4's on their mid '60's engines.
so did Corvettes in 57. but GTOs got three twos before Corvette
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