Edelbrock metering rods

[78Suburban]

I bought a 1406 and the stock rods where too lean,I went one stage richer.I bought mine at Advance.Mfg #1456......barcode #38014

What kinda motor did you put it on? Do you still have the stock metering rods? I would be interested to know what the numbers on them are. If it turns out that I have smaller than stock rods, I'll buy your stock rods and jets from ya if you still have them. That is assuming that the electric choke and manual choke carbs are the same (mine is manual choke.)

 

[johnathan]

stock 350 I do have the stock rods,the # is7547 on the stock rods

 

[johnathan]

Now for the jets I did'nt change those.The guy at Edelbrock just said to Slide the rods in and I'd be fine,had no problems since.My Blazer was surging at light acceleration,and would spit back through the carb every once in a while.

 

[78Suburban]

Straight from edelbrock's website:

1405 600 .070" x .047" orange (5")

I had an orange spring and the number on the side of the rod seems to be 7047, which should be the stock rod for a 600 cfm manual choke performer.

Also from edelbrock's website:​

Idle System: ​

​

The Idle System delivers 100% of the idle fuel. It
also meters fuel at off-idle throttle positions; a large percentage
at just off of idle decreasing to a minor influence as the throttle is
opened wider. The idle setting is critical both to a smooth idle at
proper rpm and to a smooth transition to part-throttle operation.​

Since my performance problems seemed to be right off of idle, perhaps I just have way too leanly adjusted idle mix screws.

Should stock rods provide sufficient fuel for a 350 with a stock or mild cam?

​

 

[diesel4me]

should be..

I also have a 1405 Performer, on my 305 in the 79 C10...I read the specs on its jetting and metering rods..they are set up on the rich side--it says on the edelbrock site "calibrated for maximum performance,not mileage"..whereas the other models like the 1404,1406, are jetted for "Emission legal" and mileage ,rather than performance..hmmm...mine gives 15 mpg if you drive like an old fart..!

I didn't think your plug looks too lean..its very clean,but no snow white porcelain,specks of carbon in the porcelain,or blisters on it,which are a sure sign of too lean,overheated engine,or pre-ignition..

I'd re-adjust the idle mixture using a vacuum gauge,and if your off idle stumble is still evident,then try changing the metering rods..I'd leave the jets alone...looks like its not running too lean or rich,except perhaps under acceleration..maybe the accelerator pump is worn,or its stroke isnt long enough..did ya try the other holes in its linkage??..make sure there are no vacuum leaks anywhere too...

 

[littlejimmythatcould]

I'll check what rod I have in when I get home (I don't remember what one I switched it to), but 047 is the stock size rod that came in my 1405.

 

[78Suburban]

Is there a trick for putting the rod back in the carb? I was having a hard time to get it to line back up with that spring and press all the way in.
thanks,
James

 

[1985_K5_Silverado]

A stumble just off of idle under part-throttle that smooths out as the rpms rise can be a sign that a stiffer step-up spring is needed to lift the rods a little sooner (at higher engine vacuum) and begin the transition from the idle to the cruise circuit.

 

[78Suburban]

is it concievable that rough terrain could cause a stock performer to backfire? It only happened once, and I was driving fairly aggressively in some rough stuff.