3x2 Holley carb spacing - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-17-2003, 01:26 PM
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Post 3x2 Holley carb spacing

I've located tri-power setups for SBC using Rochester carbs w/5.5" spacing. I've checked the Edelbrock page and they don't make a manifold that Holley carbs will fit. Does anybody know what the minimum spacing is for the Holley carbs, IE: Mopar Six-Pack or 427/435 Corvette? I've been told "It can't be done", so now of course, "I WANNA DO IT!".
C & S Specialties has a cool setup on their web site, <a href="http://www.candsspecialties.com," target="_blank">www.candsspecialties.com,</a> but they mount the carbs on a tunnel ram! ... AND they want 2000 bucks for it..... sheesh.

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Old 04-17-2003, 01:41 PM
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do you mean the spacing between the carbs or the bolt pattern or what? If you mean spacing betweein the carbs...you could have a block made that move the front carb forward and the rear carb back...
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Old 04-17-2003, 02:12 PM
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sorry don't have the numbers you want, but I have never seen three holleys on a 3 x 2 setup. all the holley two's I've seen are just a half of a four which would, I believe, always be too large physically. the rochester 2G is what you want; this is what it was made for.
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Old 04-17-2003, 02:27 PM
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Sorry, I wasn't clear .... I meant carb center to center spacing. The carbs I want to use are from a 340/440 Mopar Six-Pack.
It's that "plate" that I want to make, but I don't know the distance required to clear the float bowls.
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Old 04-17-2003, 02:47 PM
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If you have the carbs and a tape measure it shouldn't be to hard to figure it out? <img src="confused.gif" border="0">
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Old 04-17-2003, 03:30 PM
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It would be just that easy IF I had the carbs, but I'd like to know if it will work before I invest $1000 in carburetors.
Thanks kindly for the replies .... I'll find the answer elsewhere.
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Old 04-17-2003, 06:44 PM
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I don't have any measurements on the plates I was talking about...its just an idea I thought up when I was gonna put 2x2s on a stude motor.
Heres a rough drawing I just did to try to convey the thought...I don't know how those holleys mount..but thie would work for the old old holleys...



[ April 17, 2003: Message edited by: drgnwgn289 ]</p>
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Old 04-17-2003, 07:13 PM
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The spacing between carbs on say a Ford are different than a Mopar (like the ones you're talking about) or Chevy. Whereas the Ford used metering block on all three carbs, the Mopar and (I believe Chevy) used them on only the primary carb and the secondaries were operated by vacuum diaphragms similar to the vacuum 4bbls, allowing tighter packaging.
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Old 04-18-2003, 10:04 AM
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That's another reason why I want to use the Holley carbs, so I can use vacuum secondary carb operation like the Mopars and Chevies. I had Rochester carbs on an old 370 Pontiac in a '51 pickup years ago and they worked OK, but the linkage locked up at full throttle! Not a pretty situation. And the Hollies just look cool. I'll go to some swap meets and do some measuring and see what I come up with.
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Old 04-18-2003, 05:11 PM
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Ford used Three Holly Model 2300 two-barrel's.
Hollys site showing Nomenclature and Exploded View
<a href="http://www.holley.com/HiOctn/TechServ/TechInfo/2300C1.html" target="_blank">http://www.holley.com/HiOctn/TechServ/TechInfo/2300C1.html</a>
If you go to this site it has pics and different sites for the tri-power set ups.
<a href="http://www.gerlecreek.com/documents/tpclassifieds.htm" target="_blank">http://www.gerlecreek.com/documents/tpclassifieds.htm</a>
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Old 05-05-2004, 07:18 PM
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I have a 427/400hp Tri-power setup in my car. If you're looking for the stud to stud to stud measurements, I can get them for you.
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Old 05-06-2004, 09:20 AM
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SBC Tri-Power Set-up

If you're looking for a SBC Tri-Power Setup, check out our website at www.barrygrant.com
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Old 05-06-2004, 10:59 AM
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Stewie: Sent you a message. I got the measurements from a 340 six-pack setup at a swap meet.

Tech:
Yeah, I've seen the Six-Shooter ads in all the mags. KILLER!!
I noticed that all of the carbs are 250 cfm, for a total of 750.
I'm thinking driveability and throttle response should be pretty impressive. Looks like a viable option. Thanks
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Old 05-06-2004, 11:19 AM
Technical Support Barry Grant
 
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Throttle Respons

RaggMopp,

With the annular booster carburetors, and the progressive mechanical linkage we've designed these setups drive excellent.
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