Glad I found mine at a going out of business dealer ship. How the hell that stayed on the shelf in claimed is beyond me but scoop it up I did!
I have a 68 Dart with a stroker 340. Exploring the idea of adding a Six Pack to it. Currently have a 750 Holley. Getting 13 MPG around town driving normal using 3.21 gears and a 4 speed. Does the center carb on a Six Pack get better, worst or the same as a double pumper? Also have a 55 chevy with a Tri-Power, 3 2G Rochesters, and a 55 Ford with 3 Holleys. I gained 5 mpg on each going from a Holley 650.
Appreciate any advice offered View attachment 1715927047
Folks yammering about how a 6 pack will run with a well tuned 750-950 single 4 is total BS. They DON'T
So what about stock or SS.
It's the tune up that is the problem with his set up, I'd almost guarantee that.
Carry on.
Actually that’s not BS. They can and they do in the right hands. I have a six pack that will run as good as most any single plane and 4150 carb. I’ve done it and ran about every combo on the car. This is on a high 10sec b body street car with a 500ci motor. About the only thing that’s been a bit stronger is a Indy single plane and a 1050 dominator. The vacuum operated six pack ran identical et to a heavily ported TM6 and a 4150/1050 carb.my mechanical six pack is really strong. I think it would be within a tenth or two of the Indy single plane. Granted I build a some custom carbs so I probably have a bit of tuning advantage.
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You have a BB, different animal from the small block...
But he is comparing BB vs BB vs BB.You have a BB, different animal from the small block...
please elaborate why it’s different
But he is comparing BB vs BB vs BB.
Displaying doth combinations of 4 & 6 bbl.’s.
IMO, I agree that it’s probably his tune in the engine.
Sorry to disagree with your prior statement on the 6 pack not being able to perform as well as the best dual plane & 750-950 4bbl. I don’t think it’ll outpower it but o also don’t think it’ll loose by much at all. Thanks also don’t see a 950 cfm carb doing daily driving duties ether. But what ever one can live with……
How much time do you have in porting the six pack manifold?Actually that’s not BS. They can and they do in the right hands. I have a six pack that will run as good as most any single plane and 4150 carb. I’ve done it and ran about every combo on the car. This is on a high 10sec b body street car with a 500ci motor. About the only thing that’s been a bit stronger is a Indy single plane and a 1050 dominator. The vacuum operated six pack ran identical et to a heavily ported TM6 and a 4150/1050 carb.my mechanical six pack is really strong. I think it would be within a tenth or two of the Indy single plane. Granted I build some custom carbs so I probably have a bit of tuning advantage.
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It's the intake. They are very different in terms of performance capabilities. The RB intake is miles better than the SB unit.
Rob, This discussion was about SB's... OP's stroker 408... You may draw whatever conclusion you like to discredit the ACTUAL testing done between the SB 6 pack and Air GAP/Victor manifolds. It's not even close, 35HP was the number in the middle on the stuff I helped on.
If a person can't tune a carb to drive on the street, then a 950 likely it's not for them. Doesn't discount the difference in performance. Even a 750 will beat the SB 6 pack. BTDT
6 Packs look cool...
How much time do you have in porting the six pack manifold?
Then turn your attention to my reply to the OP.Rob, This discussion was about SB's... OP's stroker 408... You may draw whatever conclusion you like to discredit the ACTUAL testing done between the SB 6 pack and Air GAP/Victor manifolds. It's not even close, 35HP was the number in the middle on the stuff I helped on.
I’ve left replies before that I’ve had 800 cfm AFB carbs on 318’s and got laughed at and ridden like a two dollar ***** all the way to China and back while being told by my full of shift, it can’t be done.you can daily drive about any carb if it’s properly set up and you have enough engine. Keep in mind most 950’s are a 1.45 Venturi and actually smaller than an old 850 sporting a 1.56 Venturi. I daily drove a dominator for a bit. Granted I did several mods to it to get rid of the inherently fat idle and transfer circuit they come out of the box with. You would have never known it was a dominator if you just hopped in and drove the car.
I want that done to my B engines 6 pack.View attachment 1715927401
hard to say, I’ve modified it a few different times experimenting with it. I’d say I probably have 3-4 hours in it. Working on the area under the carbs really made it happy on the big motor. I haven’t ran it at the track though since that mod. I’m not a put something on a car and leave it alone type of guy. I’m always experimenting and playing with stuff. Lack of any safety equipment in the car makes it hard to run at the track to get data though.
Love the chime in Hellcat comparison.this is better than a good movie
Properly tuned six pak cars outrun just about everything.
Gas mileage is good and always better than a 4bbl set up
I work on a 6 pak 505 alum head big block in a b body 4 speed. About 650-675 hp
Runs right next to the hellcat up to 140 mph.
That looks like a Super Beeee...r!Hey man don't loose your head.
Relax and have a beer
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I have a 68 Dart with a stroker 340. Exploring the idea of adding a Six Pack to it. Currently have a 750 Holley. Getting 13 MPG around town driving normal using 3.21 gears and a 4 speed. Does the center carb on a Six Pack get better, worst or the same as a double pumper? Also have a 55 chevy with a Tri-Power, 3 2G Rochesters, and a 55 Ford with 3 Holleys. I gained 5 mpg on each going from a Holley 650.
Do the Holley's secondary carbs on a Six Pack maintain the idle circuits? How well do the outboard carbs seal? My other systems seal 99% and act as fuel dumpers only when WFO. Super easy to tune. Just trying to get educated here.
Is there a hood clearance issue using a stock hood?
Appreciate any advice offered View attachment 1715927047