Thought I would tap the collective knowledge here for some ideas. I'm using the Offenhauser intake with a 500 cfm Carter style four barrel, turned 90 degrees. I'm having a hard time finding anyone who's done this. I remember seeing some like this over the years but it was always at a show somewhere and I never payed attention to how they set it up. I read online a while back that one individual had used a Mr. Gasket universal throttle cable. I don't remember any pictures. What style bracket or return spring set up. I have a couple peddles out of various GM trucks (square body & OBS). It would sure be helpful to know what anyone here has done. Thanks in advance for the help.
For some ideas, see if you can find some pictures of Tom Langdon's linkage setup for his Weber carbs. They are set up the same way yours is on the manifold.
51 GMC 100 with 59 chevy 261 under the hood. 3 on the floor with 3.42 gear.
A cable linkage of some type will be the simplest installation, just needing an anchor bracket, and maybe a bellcrank if the direction of motion needs to ber changed. Don't waste a lot of time and money on designing a mechanical linkage, as you're not likely to be running that setup for very long. You have at least twice the CFM capacity there than the engine can use effectively, so I'm going to predict that it won't be there long. What type of racing are you doing, and how much modification does the rest of the engine have to support that carburetor?
A 250 engine at 5K RPM, with 100% volumetric efficiency (impossible) can only flow 362 CFM. You'd have to be running 7K RPM to use the full capacity of a 500 CFM carburetor. Better do some serious beefing up of the lower end to make it survive at that speed! Jerry
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On my 54 I used the Mr. Gasket cable kit and a universal throttle cable rail. I’m running a Holley 390 on the Clifford intake. Used an early 90’s Chevy accelerator pedal. Fit together nicely
KDrown I looked at that one on the Speedway website. I turned the the carb 90* to try to even out the air/fuel charge. I think that one will run into the valve cover. I do have a throttle peddle from an OBS truck. I bought a Mr. Gasket cable a while back. I think it might be the same as yours? I'm going to experiment with a Mr. Gasket bracket I found.
Powerage: that is the kit I used on my 58. My complaint is that the plastic piece that holds the end of the sleeve and goes into the metal holder cracked almost immediately.
Hey Powerage . . I am using the same OFFY intake on my car (a 69 Nova , with the stock 250ci engine = with the Holley 390cfm carb ) . I DO have my carb facing "front too rear" (not sideways) ; and the stock 69 Nova uses a "throttle cable" (as for the carb 'hook-up' ) . I used the same carb linkage "plate as , KDrown shows , in his picture, above. My Throttle Cable WORKS great , and very easy too hook-up . (I bought my carb linkage plate from 'Skip White Performance' , some years back = $ 35.00 . Summit shows those same throttle / carb plates (that fit those Holley 4160 carbs.
. . 1. - - My OFFY (yellow intake) & Holley carb , using showing my (EASY) , throttle linkage . 1969 Nova stock 250 engine (with just "bolt-on up-grades" ) .
. . 2. - - The 2nd pic shows , the OFFY intake & Holley 390 carb ; facing the 'valve cover' & using a "bell - crank" , throttle hook-up ( from Twisted6 ).
Last edited by Twinshadows; 04/01/202411:40 PM. Reason: add text
Twinshadows looks nice. On my 54, I have the carb positioned with the primaries in the rear. I used the Ryanstar bracket from Amazon. Its made for the Holley 4150/4160. The 2 return springs definately help to keep the idle speed down and stable. It does make the pedal tight when pressing down on it.
Powerage you have several options. Reach out if you need additional pics or have questions.
Yes - That is my exact throttle linkage ; that made my carb / linkage work "perfect" . Now, i see those on Summit . . . but, way higher than what I paid . Yes - on those two return springs - and I did change one of those "springs" , too a lighter spring. Then my second picture . . (another Nova Driver) . . That is what I'd use , if I had "turned my carb = sideways"
The Bell crank system, is from : Twisted6 Performance .
Thanks for the input guys! I'm going to decide on something this week, even if its wrong. I have it turned sideways just to (theoretically) even out the charge to each cylinder. I'm guessing you guys aren't seeing a problem with it mounted straight?!
Mark - - no I don't see / have any issues ; and I do run my L 6 (kinda) like i 'stold-it' . Then, Larry Pate , runs his 64 Chevy II (and 3 carbs - on his 250 L 6) , facing forward. He has done test - - running in both directions : says that he can't tell any difference . (and, he knows alot more , than me). He's at ; T6Racing.com
I do know some guys, that face their 4bbl carbs = sideways . But for me , front too back , sure made hooking up the throttle kinkage very easy . Sometimes , I just like "EASY" .
That's awesome Mick53! I did run a similar set up on dual fours on a tunnel ram way back in the early 90's. I love that kind of set up. I'll probably turn this one to face the front and get out of my own way.
That's awesome Mick53! I did run a similar set up on dual fours on a tunnel ram way back in the early 90's. I love that kind of set up. I'll probably turn this one to face the front and get out of my own way.
This is my first time dealing with duel quads and a 6-71. When I bought the linkage it was a name brand and came with no instructions except a terrible picture and a parts list. I couldn't find any other brands assembly instructions either. I guess they think if you are buying it you know how to put it together. That was the case with me once I got it figured out it all made sense. When I bent my 16 nitrous lines I had never done it before. One bend at a time and then they were done. Sometimes you just have to jump in.
I think you could see the space Station in the reflection.
1950 Chevrolet 3100 (Ol' Roy) 1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1956 Cadillac Sixty Special Fleetwood (The Godfather) | 1966 Oldsmobile Toronado (The Purple Knif) | 1966 Ford Mustang (Little Red) | 1964 Ford Galaxie 500 coupe | 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
O K , so Powerage = Mark , would you have any type of an "up-grade" , for using & hooking up your Holley 390 carb ? ? Then, for KDrown - how does your carb run on your truck . . . and, I'm asking because : we have our 390 carbs = mounted exactly "back-wards" from each other. = my car runs GREAT ; and, I'm getting 21.5 too 22 mpg . (I'm happy) . Over on 'Steve's Nova Site' , when I did my install on my 'intake & carb up-grade' . . . I always have said : "That installing my OFFY intake & Holley Carb = was the very best up-grade , that I have done on my car" .
The "second best up-grade (on my car) . . "was installing my T 5 5speed tranny" .
Also, KDrown, look back on page two - - for those two BLOCKS , mounted on the throttle plate (on each end, where those 'addapter blocks are' - I also installed a 1/4" bolt into each side - - too keep those blocks from "sliding around" . (just incase those small screws might come loose) .
Mark, one reason I'm asking is because over on SNS, we do get alot of questions about using these parts , on our L 6 engines (the 390 & throttle hook-up , questions .
Thank you ,
jim
ps = you may have noticed that my OFFY intake carb 'mounting plate' (that comes with the alumn intake) = only fits one way . (My mount plate , would not FIT , and mount down but only way (sideway's) . - just asking ? Thus, I did buy another mounting plate = too mount "facing forward" .
Last edited by Twinshadows; 04/28/20246:23 PM. Reason: add text
On the 390. It runs well with the primaries in the rear. The openings on the Clifford intake are all the same diameter. Upgrading to the 390, headers, and the intake is well worth it. The way the 248 runs now verses before is like night and day. Not sure about fuel mileage though.
KDrown - Thank you for your 'feedback' . When installing my 390 carb, I just mounted mine with the throttle linkage that "lined-up th' best" ; and things have been very good . . . . and very "simple" . With that said ('simple' ) , I had my Holley carb 'sitting in my shop for about 3 years' , before installing it. Why - - mostly because I did not want too "Mickey M" my carb linkage . . . . (and, my car was running very good, with even my 1 bbl carb. Now , like WOW , those 390 carbs have really "blasted off" (price wise - on Summit) . Also, I may have gotten a good carb = as I have installed it 'right outa th' box' , and running really good. thanks again .
