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  #1  
Old Jan 12th, 10, 9:57 PM
98form 98form is offline
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Jay
 
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Default Best carb for 3931067 BBC intake

I have a 396 bored to 408 with oval port heads that have been worked and a healthy cam. I currently have a Weiand Team G intake that is a little too much for my motor. I just purchased a 3931067 intake to get to a stock look and want to know which is the best carb for my combo. Thanks in advance!

Jay
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  #2  
Old Jan 12th, 10, 10:07 PM
Mike Mike is offline
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Default Re: Best carb for 3931067 BBC intake

It's a QJ manifold ,so why not a QJ?
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  #3  
Old Jan 12th, 10, 11:36 PM
98form 98form is offline
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Default Re: Best carb for 3931067 BBC intake

I really don't know that much about carburetors, other than their function and basic parts identification. Is there only one kind of Quadrajet or are some better than others? Will this intake only accept a Quadrajet carburetor?
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  #4  
Old Jan 13th, 10, 10:54 PM
98form 98form is offline
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Default Re: Best carb for 3931067 BBC intake

Anyone have a little advice/knowledge they can share with me?
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  #5  
Old Jan 14th, 10, 1:47 AM
SWHEATON SWHEATON is offline
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Default Re: Best carb for 3931067 BBC intake

Jay,whats the cam specs when you say its a healthy cam,q-jet's dont like lrg cams which is why i am asking.

Anyway,go to Sean Murphy's SMI website to get his contact info ,Sean can setup q-jets to run very well with fairly lrg cams on the street .

So call Sean and give him cam specs/idle vacuum in gear with auto trans/intneded use of car/rear gear ratio / etc and he should be able to get you squared away with a q-jet that shuld run decent right out of the box,costs approx $350 last time i checked.

If you call Sean tell him scott from t/chevelle rec you to him.

BTW,that 067 intake is a semi high rise intake that performs reasonably well for a stock unit due to it being a semi hi rise design.

Also,make sure you use proper gastet setup or you will cook carb with too much ex crossover heat that runs thru the chanel under front of carb to heat it up in cooler weather.

Your supposed to run a std carb gasket for that ntakes that has same chanel cut out in it along with a thin metal/steel ship/heat shiled too ,its a stock applaication thst listed under felpro as requring the steet shim/heat shiled and std carb gasket with proper cutout for heat passage too. Your local parts house or napa should be able to look that up for you.

Scott
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1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
2006 YAMAHA 1700 ROADSTAR SILVERADO (1 owner ,GOT in 2009,4,700 miles/WK end fun)
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  #6  
Old Jan 17th, 10, 8:17 AM
98form 98form is offline
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Default Re: Best carb for 3931067 BBC intake

Here are the cam specs:

- duration at .050” lift (intake/exhaust) is 264/269
- valve lift is .560”/.580”
- lobe centerline is 112

Thanks for the help!
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  #7  
Old Jan 17th, 10, 9:14 AM
mr 4 speed mr 4 speed is offline
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Default Re: Best carb for 3931067 BBC intake

Is that the L88 solid cam?
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  #8  
Old Jan 17th, 10, 9:43 AM
bracketchev1221 bracketchev1221 is offline
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Default Re: Best carb for 3931067 BBC intake

I'm going to be honest and say that now you went the complete opoosite as far as intake manifold. You were closer with the TEAM G. Granted for the street you don't need a single plane, but I would go with an Edelbrock performer rpm, or even the rpm Air gap maifold. What carburetor is on it? A good 750-800 cfm Holley will work fine on that.
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  #9  
Old Jan 17th, 10, 4:36 PM
98form 98form is offline
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Default Re: Best carb for 3931067 BBC intake

mr 4 speed, yes it is the L88 cam. This is my dilemma, the Team G intake would not fit under the stock hood and that was my main problem with it, even with a drop down air cleaner. I ordered the Weiand Stealth intake from Jegs and that came in a few days ago. That should fit under the stock SS hood. Then 2 days after I ordered the Stealth, I ran across a mint 3931067 intake on eBay and got it for $150.

I am restoring my car and I am in the beginning stages of doing so. I want to get the car running perfectly before I start messing with the body and paint. I am not sure which intake I want to go with for these reasons: The current plan is to restore the car to mostly stock form, but I don't want to go with the stock intake right now if it is going to hurt my performance by a lot compared to the Stealth intake. I currently have a Holley 4160 750 cfm on the Team G, which will also fit the Stealth. I would have to buy a Quadrajet to go with the stock intake. I can always save the intake for later if I want to go completely stock. I just couldn't turn the deal down on it, it had been media blasted, magnafluxed, and painted with a high temp cast iron color paint, no cracks or welds or anything like that.

So...I am just gathering information about the 3931067 and QJ setup in conjunction with my current setup in case that is the way that I want to go. Thanks for the advice fellas.

Jay
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  #10  
Old Jan 17th, 10, 7:42 PM
von von is offline
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Default Re: Best carb for 3931067 BBC intake

There's no doubt in my mind a properly set up Q jet is the way to go on the 067 intake. In fact if you compared a PROPERLY set up Q jet back to back with a 750 cfm Holley you'd quickly see what I mean, for drivability, reliability, smooth operation, and economy, while matching it in power. That said, the L88 cam is WAY too big for your combo. Small cubes, oval port heads, etc. A stock L78 cam or something in that duration range is the most you need IMO, unless you want the all out race motor sound at the expense of any semblance of power and drivibility.
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  #11  
Old Jan 17th, 10, 9:34 PM
SWHEATON SWHEATON is offline
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Default Re: Best carb for 3931067 BBC intake

This cam 264/269 deg dur @.05 in only 408 cubes is huge and even a pro like cliff riggles may not be able to get a q-jet to work well with a 264/269 deg dur @.05 in a small 408 cid motor.

You said you want your 408 running perfectly fpost resto which is obviously for street use,a cam with 264/269 deg dur @.05 in a small 408 will not run perefectly on the street no matter what cartbs is onit,period,it will be as street unfriendly as you can imagine in a 408.

That cam even in a 427 or 454 is big and marginally streetable at all.

That cam in a 408bbc motor will have very little intake vacuum @ idle & lower engine speed s too.

I would call cliff riggles and ask if he can setup a q-jet for 264/269 deg dur @.05 in a 408 and see what he says esp if this will see a fair amount of street use too.

Even though i treuly love the q-jet for many perf apps in this case with a huge cam in a fairly small 408 it will likely not work out . And even if a q-jet was heavily moded to run with all that cam whicxh i am not sure can be done reliably it still would not be at its best. That's because in this case a q-jet would need to have such deep mods done to it to run with such a lrg cam in a farily small motor that it would nullify the good trates a q-jet nornmally has for street appliactions that it would likely not be worth it iMHO.

You may have to run an adapter to use holley carb on that 067 intake that will hopefully not place the carb too high and cause clearance issues,thats the route i would look into if i were you for reasons stated above.

But as Von already stated a properly setup q-jet with an L78 cam and proper compression for that cam would be a good setup.

Scott
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1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
2006 YAMAHA 1700 ROADSTAR SILVERADO (1 owner ,GOT in 2009,4,700 miles/WK end fun)
1977 KAWASAKI KZ1000 (AM ORIGINAL OWNER ,GOT IN 1977,NOW has 29k miles/WK end fun)
2002 MAXIMA (DAILY DRIVER/1 owner,GOT 3/2013 w-44k miles)

Last edited by SWHEATON; Jan 17th, 10 at 10:00 PM.
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  #12  
Old Jan 18th, 10, 3:56 AM
Bunz-T Bunz-T is online now
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Default Re: Best carb for 3931067 BBC intake

Wish you would have bought my 067 for less than 1/2 of what you paid.

With your hood clearance issue it may be very difficult to use the current cam and match components. It appears it will take a lot of things to make it all work together, if at all. It might be easier to swap cams now to match the carb and intake.

Here is what you will get from a Sean Murphy carb. Out of the box, onto the intake, fire it up, touch virtually nothing and wonder how he did that. You will not buy any other item that you will enjoy the purchase experience more and he will always be there for you.
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  #13  
Old Jan 18th, 10, 6:32 AM
71454Chevelle 71454Chevelle is offline
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Default Re: Best carb for 3931067 BBC intake

You are not going to get a Q-Jet to work properly with that cam.

My brother is in the process of planning a nice street 454 for his Nova. He is wanting to use a Q-Jet from SMI. Talking with Sean (at SMI) he said low to mid 240's @ .050 in a BBC is about the max you can run and get the metering of the Q-Jet to run properly.

Run the Stealth and but a Holley on it.
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  #14  
Old Jan 18th, 10, 8:20 AM
mr 4 speed mr 4 speed is offline
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Default Re: Best carb for 3931067 BBC intake

If you are going keep the L88 cam,I would use the Stealth and your current carb.
Park the 067 on the shelf...
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  #15  
Old Jan 18th, 10, 4:44 PM
von von is offline
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Default Re: Best carb for 3931067 BBC intake

FWIW the way that many NHRA Stock and Super Stock racers get Q jets to work with their huge cams (esp in SS) is to use the "no rod" method. Remove the primary rods and jet down 5 sizes. This creates approximately the same jet area as the normal jet size with the primary metering rods at WOT position with just the .026 tip in the jet. Obviously this eliminates one of the major advantages of a Q jet in having less mixture control over the range of different loads and throttle openings. Not recommended for street use.
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