Holley Carb adapter
Recently bought a offenhauser 4 barrel intake for my 292 with adapter. Just bought a rebuilt Holley 550 4 barrel carb. Low and behold it sits on the manifold sideways. I would like it to sit like a V8 with the linkage on the drivers side. I've been looking at adapters to correct this, I'm thinking they must make one, but no luck so far. Has anyone else had this situation, if so what did you do to correct it?
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Re: Holley Carb adapter
As far as I know they don’t make one.
I saw an adaptor on a thread somewhere that was made from 1/4 inch flat plate. Holes drilled to bolt the Holley on and counter sunk holes to adapt the plate to the intake. |
Re: Holley Carb adapter
Do you need an adapter to mount the carb or a linkage adapter?
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So you want the primaries to open up and feed cylinders 1-2-3, and then the secondaries feed 4-5-6?
I prefer the carb to face the drivers side fender... I ran a Holley 4160 [R8007] 390 CFM for 25 years on that Offenhauser intake. I had to saw off the ford-style automatic transmission kickdown lever, but since it's a Chevy and I run a manual that didn't matter. When I rebuilt in 2005, I went to an Edelbrock [500 CFM], as my 390 Holley was shot. |
Re: Holley Carb adapter
Theres a company called, Transdapt that might get you there, if they are still in business.
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I suggest modifying the '68 accelerator push rod set up to '72 style cable throttle. I ran the old push/pull rod for a long time but it was cr@ppy. Linkages came loose, small bits fell off, it even iced up once in the mountains. Too much of a Rube Goldberg. I changed to a cable and it was never smoother. And you can mount your carb in any orientation you want.
This is the cable I used. A GM cable/gas pedal assembly off a '71/'72 truck was used in the cab. I used a Jeg's throttle return spring to retract the spring on the engine side. [A big screendoor spring to the brake master cylinder was ruled out as too Retro-Jethro]. |
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The offy intake turns them all sideways.
You’ll need to make an adaptor to change that. Clifford intake is set up to do what you want. |
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Here's a bell crank arrangement I made for mine. I believe the aluminum elbow came with the exhaust manifold but I had to modify it. This works ok but it took a lot of trial and error and I plan to change to a cable setup when I have time.
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http://t6performance.com/ This guy (Larry P.....) makes a new plate or modifies your original Offy plate so that it can rotate the carb 90 degrees. I have heard nothing but good from him on the 6 banger boards and I talked to him a good hour when I was planning on twisting mine around. I have not done it yet because on on install in an 81 truck, the factory cable comes in that way for the stock integrated 2bbl setup. |
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I've met Larry Page. Really nice guy. He used to be Pres of the Daytona chapter of Inliners International. He helped me [via emails] on tech questions when I was rebuilding my present 292 from 2002 -2005. The Man knows a lot about the Chevy L6 engine.
Larry also participates in this website as ''Twisted6'', usually on the 60-66 forum. Still wondering if there's any advantage from having the primaries opening over 1-2-3 and secondaries over 4-5-6 with a carb-to-front orientation? |
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From a few folks I talked to, unless your racing you probably won't notice much difference. I think Larry is working on a full EFI setup now for the 250/292.
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The offy is a single plane style with plenum and runners all open. All six cylinders see the primaries or the secondaries at wot. |
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My stock carb on my 292 is shot. What is available in larger CFM but without an Offenhauser intake? Is there something available to bolt on to the stock intake? Searching comes up with 4 barrels with rectangle mounts and 4 bolts. My stock intake is round with 2 bolts. Or am I dreaming?
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Re: Holley Carb adapter
This one is about 1 1/2 inches tall.
Will run a 2gc. https://www.tdotperformance.ca/trans...SABEgLHhPD_BwE |
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Thanks, Geezer. |
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Thanks Geezer. I have it in a shopping cart. Now to find a 2 barrel at 390 CFM. Thanks!
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Re: Holley Carb adapter
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Re: Holley Carb adapter
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Re: Holley Carb adapter
I had my Holley 8007, 390 CFM turned so the primaries were inboard and the throttle lever over the Rear intake. Required some surgery.
What ever makes it work for you. |
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