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750 Mighty Demon on my 340 with 3.55 gear and a 3000rpm stall and heres the issue. Pullng about 9" of vacuum in gear warmed up so I swapped to a 4.5 power valve 65 Jets in the front 75 in the rear this was checked on an exhaust gas analyzer while driving. 31 shooters front and rear and red...

Currently running an FBO "special" mechanical fuel pump on my mild 340. Twice this has happened now. After a WOT then off and just rolling the car starts to stumble smoke and then die. Had the air cleaner off on the side of the road and the carb is pukeing fuel bowls are way over full...

On my 750 Mighty Demon annular I have a slight stumble/hesitiation @ 1900 to 2000rpm while cruiseing only with a slight tip into the throttle. It had factory 31 shooters front and back, I changed the front to a 35 and it seemed to get a bit better. Should I keep going bigger or is there...

As stated in a previous post I tested a 750 Mighty Demon on my 340 in place of the 650 speed demon it currently runs. The mid range and top end where awesome and the idle quality was atually much better. The engine shop can get me a 650 Mighty Demon -all he says I need- or they also deal...

Well working out the bugs on my Duster and it's bog issues. Borrowed a 750 double pumper Mighty Demon, it was set up for a 408 stroker so it was pretty rich on my 340 but even so it ran better and the mid range and top end was way better then my 650 Speed Demon. The bog was a little better...

Has anyone run one of these? Still on the fence over the vacuum secondary vs DP but I like the fact the ultras are available with an electric choke, don't care about the colours really.

I bought an FBO mechanical fuel pump a few years back, the ones that claimed to be ported polished etc. I had tried running an Edelbrock AVS on the car and it POURED fuel down the carb when running. Curious if my Demon doesn't have a similar issue at times. After ready a bunch about fuel...

I blocked the crossover up on my edebrock rpm with the optional felpro gaskets. With no choke it's obviously pretty cold blooded. Thinking about pulling the intake or picking up an LD340 to be powdr coated. Living in Canada and dealing with cooler mornings and driving the car into the...

I bought a sumped tank that my car really doesn't need a few years ago from a nameless vender. In the last year it would weep fuel from one of the plugged bungs on the sump. Recently it's gotten worse leaving a spot of fuel on the garage floor. Obviously not cool. I assumed it was the...

I've fought with the same issues from day one with my 650 speed demon mech secondary carb. Great mid and high rpm throttle respone and power and poor bottom end. This car most days wont even do a brake stand. The carb has even been tuned on a gas analyzer and otherwise runs great. I am...

Still have an urge to try a Street Avenger carb on my Duster. I just don't think I have the gearing for the 650 speed demon with mechanical secondaries. I assumed 670 would be the right cfm but I see guys up around 770 as well. It's a warmed over 340 with a 3000rpm stall and 3.55 gears...

My 71 Duster was a Canadian built car so from what I've seen and read it had a fuel tank vent similar to the Califorina cars. I had a hole in the trunk for the vapour tube but it's all long gone. I have a 72 and up style tank with the single vent line currently plugged off. Obiously this...

Well the TQ isn't as wonderful as it was made to be but it was only a loner so back to the drawing board. The fact it idles way better with the TQ leads me to think the Demon might have an internal issue. Looking online at Quick-Fuel's street vacuum secondary carb how does it compare to an...

I had a local guy put a thermoquad together and get it set up after having so many issues with my Demon. It starts and idles cold amazingly now and just idles better all around. As for power the bottom end is better mid range and upper are similar to maybe a little less by the butt dyno...

I know a few guys here run one. Curious about likes and dis-likes. Was reading about their vacuum secondary street carb, just in case my local deal to have a thermoquad done falls through.

With my wanting to try a thermoquad my question is will it fit on an edelbrock rpm with a factory 71' Aircleaner and have hood clearance?

Is he still doing his thing? I can't get a reply from him by e-mail

Last time I was cut off in the Duster -it happens way to often- I was only under 1/4 throttle and when I hit the brakes hard the car will stall and only under these panic stops will it happen. It's a 650 speed demon and the floats are set correctly as per FBO and my engine shop. 3/4 front...

Can anyone explain or show some pictures how the tube in the trunk works?

Have a few multiple questions First on my 71' Duster the vent for the tank is in the gas cap as I dont have the strange tube in the trunk, someone removed it. Last time it got hot it blew fuel vapour out the cap, which melted the paint on the backside of it and ran down the car. Not fun to...

I am at the point of either modifying my throttle bracket or finding a new cable. With the correct linkagae adapter on the carb and correct throttle bracket the cable sleve where it is clamped is so far back towards the firewall I worry it will not stay held in one day. Is their a...

Anyone useing a common point to splice in for an electric choke?

I'm not a huge carb guy and have not had much luck in the past. I do try to learn though. I currently run a 650 Speed Demon mechanical secondaries in my 340 Duster 3.55 gears automatic trans with 2800 stall. It runs a Hughes cam #heh2328al 111deg lobe seperation/installed centerline...

When is it deemed nessesary to run the 24" long cable? With my 650 speed demon factory throttle bracket and factory 19" throttle cable -or I assume factory- on an edelbrock rpm intake I don't have enough length. 24" seems like a lot to me though I need 2" if even. Right now I am runnign a...

I recently swapped my Lokar cable out for the factory type kickdown linkage. I just never liked the way the lokar cable made the tranny feel. At any rate I put the mopar to demon linkage on the carb and went to hang the throttle cable on and theres not enough adjustment in it. I'm about...

Tore the ehads off the 340 to have a look see at what made it tick. So what I found was a 4.07 bore -.30 over pistons- Stock stroke and its usueing TRW Forged flat top pistons with valve releifs. It has J heads with 2.02 intakes and 1.60 exhausts. Useing the mopar 284 - 484 cam in it...

Plans on pulling my nasty looking LD340 off this winter puttign new steel inserts in for the weak threads on the t-stat houseign and haveign it powder coated. But before I do all this work is there something better out there then this old design? I like the airgap but not sure abou hood...