on a quad the first butterfly is your choke and the should only be closed when the carb is cold, the secondaries dont have butterflies those are air doors that stay closed for the most part until you harmer on it thats were the quad wail comes from.

dont pry on anything as to bend a throttle plate be gental, with todays gas you are probably srubbing your fuel tank kleen or you have a niebor who dosent like you, in any case dirt has to come out i would clean your tank a replace a filter in might take a few, lube up the carb with penetrating oil and gently work lose everthing should work freely

if i remember they have lockout on the side that could jamb with the carb off work the throtle plates by hand and lube them

there was a big build up of dirt and what not! holding the butterflys closed i dipped the carb in oil LMAO i have a open vucket of oil.. soo the carb is lubbed up real good im expecting a big blue cloud coming out when i start it LMAO

it was on my 305! and i can't ind the # at all???? i can find it on my 2 barrels but not on this carb

i had to replace most of the ignition and the carb bowl was blocked by dirt soo i had it running by jaming a screw driver and opening the primary's! lol it's a 1984 305 out of a 1984 gmc 1500 also i was just pouring fuel into the engine basically!!!!

it looks like this engine was from a 79 malibu instead of a 84 gmc???????? intresting

alright that sounds.i found an issue with my vacuum secondary as well it seem even when i  plug the hole in the back with my thumb it still decompresses?

Rat Boy wrote:

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Was that 305 running when you got it? Maybe John know's something about the carb, what year it is etc...

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 What I know about the engine is very little..... A guy I work with said the history was..... A low mile junkyard 305 a guy bought and put in his truck, ran good, drove the truck then parked it (bought something else)  Guy from work bought it never did anything with it so I don't know how long it sat for.  I trusted him that it was a good runner and had hoped Jonathan would have little to no problems     Sorry I don't have anymore info than that.....

Ooooo, I found a Quadrajet on my shelf coded for a 400 small block. That might be the one JD.

jonathanD wrote:

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73SC wrote:

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Ooooo, I found a Quadrajet on my shelf coded for a 400 small block. That might be the one JD.

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 is that good?

 

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 Ya, you get to tell everybody you got a small block 400 carb, most cruise night lawyers will start arguing with you that there never was a small block 400. It's a good conversation starter. 

Professur wrote:

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I'm gonna disagree with chucking it tho. $20 gets you the Q-jet manual at Canadian tire. A busted carb that you're not relying on is the perfect platform for learning all about them.

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 ....and so expalins why I have milk crates full.

Ok, go back there and write down the numbers on any that start with 702 or 704. Send me the numbers and I will tell you which ones to grab. Chevy carbs have 90 degree fuel inlet Pontiac Buick Olds are straight inlet.

If you see 7040270 take it out of the pile and come directly to my house, I will pay you $200 for it.