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My 750 mighty demon does the same dam thing! ( got a thread about it going in electric/ignition systems) It ruined the diaphragm in my vacuum advance! So ive sourced manifold vacuum for the new vacuum advance can from the intake manifold its self from a runner close to the plenum. So far no...

How in the world are you guys getting 14-15 afr's at idle & able to keep the engine stilll running?!?!?!? neatther one of my darts (one is a mild but strong hi-po 273 4-speed. The othere is a nasty 340 automatic with 3800 stall) any leaner than 13 both engine's start to miss & can watch vacuum...

939cfm I was close!

Back in the day carter made a three barrel AFB carburetor I think for pontiac that I thought was around 900 cfm. Look up "three barrel carter afb" kinda cool looking carbs!

Gat a wide band meter/gauge! Decent one's are just under $200 and know for sure what way to go! For that price theres no reason to not have one! Will save ALOT of wasted fuel & headaches!

LMFAO!!!!!!!!! Sure looks like a HOLLEYon fire! Thats good s/$*t rite there!!!!!!!!!

Fixed an old 307 sb chevy quite a while back that did the same thing. Sounded like a machine gun outta the carb when the throttle was opened. AsRusty & yellow rose said Iit had a wiped out exhaust cam lobe. $20 says you have the same issue man. New cam & lifters and that 307 ran great! For a sb...

the rear blades from the factory were as shut as they could have been already.

I went through a situation like this with a quick fuel 450 dp carb. No matter what I did to the idle feed restrictions or the idle air bleeds (im using a wide band) just rite off idle into transition it would go off scale (16.5-17.8) lean until you got past it or low enough vacum to trip the...

Most all (at least today) marine carbs have the bowl vent re-directed back down the carb In case needle & seat sticks it will keep fuel from running all over in the boat. Thats pretty cool stuff rite there man!

Im trying to upload a few pics of how I mounted my coil to the passenger rear carb stud to look stock & not drill any holes in the inner fender. Yeah I know it runs cooler on the fender but each to there own. Also the kickdown linkage will need to be modded (it an automatic) to work correct with...

Your not alone in the "banishing the bog" fight. I had same issue with my eddy 500 on my 273.I ended up (after tuing idle, cruise & power circuits) getting an accelerator pump & spring from a 800cfm eddy due to it have a heavier spring (faster pump shot). Then used counter weights from the 800 &...

He is referring to the "idle" jet not the primary main jet. The idle jet is the small brass tube in the primary booster its the small one drill it out in .001-.002 steps. That totally cured my off idle lean stumble. (Tuning with a wide band meter) its real easy to over do it is whay you make...

Again before you start doing mods pull carb off & make sure the transition slots are not over exposed 1st!

Wide band O2!!!!!!!!!! How much of your transition slots are exposed? If too much it will idle rich & have hesitation when accelerating from off idle. Demons had a sweet air bleed right into the center of the carb to get the idle speed up & not expose the transition slots. Or the old school way...

Another vote foe AEM!

Man if is worken good & just want to fine tune it spend your $$$ on a wide band band o2 meter & fine tune what you have. Vacum secondary carbs are more forgiving of mismatch parts & lower torque motors but proper tuning will make any carb work great! I've gotten them both (mechanical &vacuum...

Is it a 4bbl carb? I do like the electric choke by far! If there is aftermarket electric choke conversions ava then by all means get it! If the intakemanifold hasn't been off in a while I'm sure the crossover is plugged anyway with carbon & the stock style choke probably don't come off very...

I would leave it on there man. especially if its close to stock. The smaller port version of that ld340 is the ld4b.

^x2!

I had a profrom main body on my old 3310 holley (until i swapped on a race demon 750 best race style carb EVER!) it worked pretty good but not as good as the demon did hands down! Also got some profom rocker arm's ONCE & they were the biggest waste of money ever on rockers! Raitos were all over...

X2 on the thremoquad great carbs!had one on my old stock 318 in my 76 dart worked GREAT!

If you heads are stock small port go with the performer or even better yer an old LD4B intake & 600 cfm carb. You will be very happy with the out come from that combo. I know weiand makes a dual plane i think that has the smaller ports but don't know the part number or name of it. Another fall...

In a word....YES! i just swapped out my stock 4BBL single plane intake for a edelbrock LD4B intake & it picked up low end grunt it never had! Plus i use a wide band 02 meter to tune the carb. After installing the LD4B my air fuel raito cleaned up 12.6 beforehand to 14.4 at cruising light...

Yep my AEM wideband was 160 to the door. There super easy to install & the headaches & money that it will save you are priceless!!!

Get a wide band 02 gauge & tune with that! it is hands down the best way to tune carbs & you will know for sure what way to go. There around $ 200 bucks & will pay for its self when the guessing is done.

DEMON for all out power HANDS DOWN! & AVS style 4BBL for street use & ease of tuning. Thermoquad when ever possable DONE! Only reason the TQ is last on my list is harder to find tuning parts for it,Sweet carb just not as much for it out there easy to get for it.

Yeah & that butane enriched "swell" also ping's easyer in higher comp motors to! Ask how I know!!

Good god,if you do find a D4B intake PLEASE don't f$@* it up with drilling the holes! Id gladly let you make money on it selling it to me! Us 64-65 guys are limited!