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What type/model carb(s) are you using?
Seeing all the carb problems popping up (no pun intended) and issues with carb tuning (my own included), What carb or carbs are you using and what are their advantages and/or disadvantages?
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I'm using Holley 660 CFM carb's with center squirters and mechanical secondaries.
While mine do work well, I would not recommend them unless you have someone with a dyno, and a lot of experience to work on them. |
Since I am running a 351W with Price dual quad intake which is set up for cruising rather than racing, I chose a pair of Holley #8007 390 cfm carbs. I enrichened the primary jets by 2 numbers, no other modifications made. Personally, I like the way they perform as I prefer vacuum secondaries over mechanical.
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Holley 4160 model R80508 (750 CFM single pumper) on a 351W - Electric choke, vacuum secondaries. No issues for 10 years.
Bob |
Holley 4160 3310 on my FE. 750 CFM, vacuum secondaries, about as easy to tune as carbs get. I am considering putting on an original Holley 3255 with Lemans bowls, but I am hoping for a better experience than Elmariachi had...%/
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I have a Holley 3255-1 LeMans and am now in therapy.:LOL:
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Doug, why don't you just put the LeMans bowls on the 3310?
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I might be coming a bit obsessive...:D Sort of like Rodknock and his Hallibrands. :rolleyes: |
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Fussed with an 850 Holley for way too long before settling on a Barry Grant Mighty Demon 650 cfm. Modified the jetting and added jet extensions. Works absolutely great on my 418W. Gave up 15 hp at the top end for 19lbs torque in mid range with this setup.
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BEFORE Le Mans bowl carb's, in 65 or so, Holley did not have any center pivot floats.
Jump ahead to today. Holley center pivot floats of an entirely new design are readily available. The center pivot concept is specifically for addressing the needs of road racing G forces acting on the fuel bowl level. "Off roaders" whose vehicle may be subject to extreme angles would also benefit from this. Problem for some of us is, you can't run ANY center pivot float on a dual four intake manifold without clearance issues between the two carbs. I've run three different Holley carbs on my dual intake, they ALL had the same problem: Float level to high or to low under extreme cornering conditions. None of them was center pivot of course. I'm not sure anyone makes a side pivot float carb designed for road racing, or off road use, that will fit on a dual carb intake? If so, I'd buy 'em!!! I can't find anything that works well for auto cross on a dual intake. And I've spent a bunch of money trying, did a bunch of modifications, it aint working. |
I run a Holley 850,modified to 930 CFM by BoLaws.The choke horn is milled off and I'm running 83 jets all around.
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I'm running a pair of custom built QuickFuel 750s built expressly for my 482 setting on a ported and shaved Dove Tunnel Wedge. First time with them on the chassis dyno and AFR was 12.5 @ WOT. They work PERFECT.:D
Notice the stainless steel intake manifold "stud kit". No more stripped out aluminum head threaded intake manifold bolt holes. http://i140.photobucket.com/albums/r...alquads001.jpg |
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...and don't forget to list the jet sizes if you remember!
That tunnel port dual quad looks tight man, (in more ways than one). :) |
Pro Systems 1060 CFM on Roush 427R single plane intake.
Highly recommend |
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I've got a Bigs Stage 5 Double Pumper 750 CFM. No choke, no problems. I think the key is when you buy the carb, you tell them what kind of engine and they set it up to run out of the box. |
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The cam is a KC/Comp Cams hydraulic roller, 242/248 w/ .644 int, .633 exh The cam's pretty tame as I can cruise at 1300/1400 RPMs w/no bogging or bucking. The idle's a different story, a bit radical (as I like it). 2.19" intake with 1.76" exhaust on the valve sizes... KC's stage II Ebok heads. |
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pump nozzles: 31 boosters: 45206-1 booster pin size: 160 high speed bleed: .033 idle air bleeds: primary = 76, secondary = 36 main jets: primary = 76, secondary = 84 power valve: 4.5 power valve channel rest.: .055 emulsion and stages: .032/.028/.028 kill bleed: primary = .028, secondary = .028 idle feed restriction: primary = .033, secondary = .039 cross channel: primary = 144, secondary = 144 needle and seat: primary = 10, secondary = 110 float type: nitro accelerator pump: 30cc accelerator pump cam: orange Talk about large/straight ports on the TW... You can see the top and stem of every intake valve along with the valve guides from the intake's carb pads. It's a real straight shot to the valve for the intake air/fuel charge. The intake is no taller than an Ebok RPM so it fits under the hood nicely. |
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