I have a offy intak manifold and on the plate where my carb mounts, it has four seperate holes. When I look at a bunch of pictures of the Clifford 4 bbl, there is just one big hole, should I cut out the center to make it one hole??? Also, the guy at my local parts store recommended that I mount my carb sideways, so I did that (My throttle linkage on the carb is closest to the firewall).. Is that right, or should I turn it 90 degrees?? Thanks for all of the advice, this site is awsome!!!!

D.J.
67 Cuda
Slant Six Powered

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D.J.
67 Cuda
Slant Six Powered

the only differience is for placing carb and gasket, I Think that Offenhauser manifold was design for Holley carbs, and for that is the holes are all equal, and manifolds that got a single hole are more "universal" for carburetors.

You know some carbs got bigger barrels than others and that can be a problem with offy intake, check if current holes get in the way of your carb barrels, is that is the case, I suggest to make them bigger but not make a complete hole.

For Carb mounting, I think they told you to put it in that way for comfort, when your car is 1 bbl, the throttle linkage is close to the firewall and when you got a Super Six car, throttle linkage is close to drivers whell and in that case it got a adapter to put linkage.

That´s my opinion about this, but better wait for some more experienced people to give his call.

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Mopar Muscle is well defend by Slant Six!

Valiant Duster 1971

Opening the plenum up will kill some low-end torque. I ran my Offy as is and it always worked very well, and had gobs more low-end than a Clifford.

Carb mounting is the never ending battle. Look at 100 Slant cars and 50 will have it paralell and 50 will have it crossways.

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Official Cookie and Mater Tormentor.

All factory (GM, Mercedes) L6s that I have seen have the secondaries facing the engine. Also all factory L6s used a spreadbore style of carburator. The DC \6 Racing Manuals have the primaries facing the engine and use Holley/Carter square bore carburators. Most people just have the primiaries facing the front of the car, as the throttle linkage is then easier to hookup.

There were no spread-bore carburetors in '60 when the Hyper-Pak Slant-6 came out.

...No.

50 will have it parallel and 49 will have it perpendicular.

And one guy will have spent a fortune to custom-fab a manifold and linkage setup that mounts the carb on a 45° diagonal, and he'll be selling Kinko-bound books out of the trunk of his car, all about how Big Oil is trying to buy up and suppress his amazing Diago-Shazam carburetor mounting method, 'cause it makes even the dowdiest old 170 with 600,000 miles on it get 40mpg while hauling a '62 W250 pickup truck from 0 to 60 in 4.4 seconds.

Well I got my QuadraJet and his primaries facing the engine, and big bad secondaries facing the whell of my side, but I have notice that Offenhauser manifold got all those barrel holes a little small, when I open my primaries, holes are too big, but when talking about secondaries, holes a small. Is that all right?

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Mopar Muscle is well defend by Slant Six!

Valiant Duster 1971

Are you sure, the Mercedes used a spreadbore Solex before they went to mechanical injection in the early '60s.

Alright, if that's true, then we'll just amend: There were no spread-bore carburetors from American makers, on American cars in '60.

I had a '68 firebird spint ohc with a quadrajet from the factory.

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Franklin
'61 Valiant

Picky, picky... Put the hyper-pak was a over the counter dealer installed option. So it really doesn't count...