Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

quadrajet carb for dirt track

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Down South:
I don't know what the rules are for pure stock, but big block trucks had bigger fuel lines. I suspect cars did too.
Qjets can run low on fuel volume in the 1/4, increasing pressure isn't the cure, Volume is.
Where the sump is, line size, Can you run a high volume booster pump near the tank?
What pump is on the motor?
Still got the internal filter in the carb? Screw on inline filters have much more flow and micron rating.

Major acceleration and steady turns can force gas away from the pick up and does it have a screen on it? You want the pick up in the high pressure area.
It has already been said about float needle/seat size.

My list doesn't have that number, 7044227 CHEV 74 454 SUBURBAN, then then 62.
Swap enough parts and get any combo.

If you are serious get a couple books, Cliff Ruggles, Doug Roe I am sure these will tell you more than you ever wanted to know

DS

Ethan1:

--- Quote from: Down South on January 22, 2012, 06:17:24 PM ---I don't know what the rules are for pure stock, but big block trucks had bigger fuel lines. I suspect cars did too.
Qjets can run low on fuel volume in the 1/4, increasing pressure isn't the cure, Volume is.
Where the sump is, line size, Can you run a high volume booster pump near the tank?
What pump is on the motor?
Still got the internal filter in the carb? Screw on inline filters have much more flow and micron rating.

Major acceleration and steady turns can force gas away from the pick up and does it have a screen on it? You want the pick up in the high pressure area.
It has already been said about float needle/seat size.

My list doesn't have that number, 7044227 CHEV 74 454 SUBURBAN, then then 62.
Swap enough parts and get any combo.

If you are serious get a couple books, Cliff Ruggles, Doug Roe I am sure these will tell you more than you ever wanted to know

DS

--- End quote ---

 Carburetor 7044230 is from a Chevrolet Blazer & Jimmy CK10 (exc. Sub) Non-California M/T 350cid Engine. :)

73 Z28:

--- Quote from: crews58 on January 22, 2012, 05:37:51 PM ---73 z28, i dk much about these things, i mean i took it apart and i can put a rebuild kit in it but as far a needle in a hole? which one. pics could help, and i havent set the float yet

--- End quote ---

The needle/seat assembly that i'm referring to is the float needle and seat. To open the hole size to allow more fuel for a performance application, simply remove the float and float needle , then unscrew the brass seat, flip it upside down and drill it out with a .130-.135 drill bit. This will allow
more fuel volume to the carb bowl so it doesnt run low during a race. Hope this helps.

Paul

crews58:
now i ran the numbers on this carb, 7044230, is off a caddilac, which i can buy b/c the previous owner has a label on the side that says 74 caddy.  ok so 73 z28 u say drill the brass seat, no problem. Sounds like a good idea, just i get nervous tampering with internals,  that wont make this thing run to rich and possible choke the motor down? will it? also what kind of noticable performance do you see from doing this?

Ethan1:

--- Quote from: crews58 on January 23, 2012, 02:18:33 AM ---now i ran the numbers on this carb, 7044230, is off a caddilac, which i can buy b/c the previous owner has a label on the side that says 74 caddy.  ok so 73 z28 u say drill the brass seat, no problem. Sounds like a good idea, just i get nervous tampering with internals,  that wont make this thing run to rich and possible choke the motor down? will it? also what kind of noticable performance do you see from doing this?

--- End quote ---

 I know. It was also used in Chevrolet Blazer & Jimmy CK10 (exc. Sub) Non-California M/T 350cid Engine, too. ;)

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