Need Tech Help - Carb choice?

Picked up a 6 carb set up for a sbc. I plan to run it on my sedan powered by a 327. Since this is my first attempt at running anything more then 2 carbs, I need help on determining which carbs to run, I have heard the center two are different the the outer 4? is this true?

Thank for this Tech help.

 

Well, you definitely need early-style carbs (Stromberg 97, Holley 94, etc.) because of the 3-bolt base pattern. Strombergs are a safe bet as the manifolds were usually designed with them in mind and sometimes Holleys won't clear. You could also try to run small-base Rochester 2Gs with adaptors to the 4-bolt pattern but I don't suspect it would look quite right. Good luck getting six-carbs to run right on a 327, if you do, I'll be impressed.

 

Boones,

What you have there is too much carburetion for a 327. If you're dead set on running it, your options are: 48, 81, 94, 97. The 48, 81, and 97 are similar in design, in that they have no power valve and are about as mechanically simple as a carb can be. The 81's are the smallest and the 48's are the largest. The 97's are going to be the easiest to find. 94's will work, but you're going to have a hell of a time dealing with the power valves. I'm running 48's on my 283 because I didn't feel like dealing with three power valves, let alone six. If appearence and convenience are your priorities, block off the outer four carbs and run the center two. For more "hands on" info, you're going to have to ask an oldtimer or someone else who's done this more than once.

Ed

EDIT: Too much carburetion for a "street driven, stop-and-go, part throttle, stay cool in traffic" 327.

 

My plan is to run only the center carbs as I also agree all 6 is to much even for a strong 327. I also figure it will be cheaper to buy 2 good carbs and 4 dummies (needing work).

So the 97, 48, 81 are all the same pattern?

 

the base pattern is the same on the 97, 48, 81.

the 4 bolt rochesters do have 2 different size bases though.

cores for the ends should be fairly inexpensive.


jerry

 

cool, does anyone know the cfm rating of the 48, 81 or 97?

 

Boones,
A good friend of mine worked for Don Garlits and while he was working at the museum, he acquired an old McGirk 6X2 intake for a small block Chevy. I've been offered the manifold, for free, if I could come up with the carbs for it. The 40 Ford I currently drive, has a stout 355 with dual quads which run super. So, that being said, I realise that the six duece set would be more of a looker, because I doubt that it would out perform the two Edelbrock Performers. My friend is a well respected engine builder in N.W. Florida and works often with someone your probably familiar with, Gene Fulton. I didn't want to accept the manifold unless I intended to use it, so my buddy and I decided that if I could get my hands on six carbs, he would put the set up on one of his new engines and while he's running it on the test stand, he'd tune the carbs, etc., so that when I got it back, I could put the manifold on my car, set the idle screw, and
let it rip! So far, I've acquired four carbs and it's a mixed bag, some 94s and the others, I have no clue as to what they really are, only that they are very similar. It really didn't matter to me, because I was only intending to use them as cores, for buying good rebuilt carbs. I found a couple sources, VintageSpeed.com & hotrodcarbs.com, All I can say is that I hope you have an open checkbook! Your right about the carbs you want to run, being different. The two center carbs should be primary and have idle circuits and chokes. $135 per carb and that is if you have an acceptable core to trade in. $300 for the linkage and who knows how much for the fuel line and pressure regulator. Of course you'll want to have the stacks that you can paint red inside. It cost me almost a grand to set up my dual quads and that was buying a good used manifold, they work well, so I think I'm going to stay where I'm at. I think the six deuce thing can look good on the right vehicle but if you want to do this right, it's going to be expensive. I know that two fours doesn't appeal to everyone, but my suggestion would be three deuces with GM carbs. Less money and much more streetable.

Shoe