Carburetor Mods

[jacob_coulter]

I have a 78 K5 Blazer, with a stock 350, and a stock Quadrajet. I think the current carb's metering rods are too lean, and I wanted to fatten them up.

This may be like taking a shot in the dark, but can anyone here recommend a good ballpark size for the metering rods to add some performance? I really don't have the time and money to buy a lot of metering rods and experiment. Anyone here have good luck with a particular combo.

The car idles and starts great, it just doesn't have much grunt. The engine has a stock GM dual plane manifold (No EGR) with a stock quadrajet with a dual exhaust, no Cats. According to the build plate, the car has 3.73 gears.

Thanks for the help.

 

[pauly383]

What size tires do you have ?

Gearing has just as much to do with grunt as the engine , which in your case may be stock and tired anyway .

Some to read on Q-jets

http://www.mako.com.au/buick/html/qjet_tips.htm
http://dyeager535.topcities.com/indexquad.html
http://www.hioutput.com/tech/qjetrod.html

 

[jacob_coulter]

The tires are 33 x 12.50 15 LT

Thanks

 

[pauly383]

I run the same tires , and gears with a little 305/700r4 combo , and a stage 1 q-jet . A/C off I move pretty good .

Probably time to rebuild it , or replace it .

And maintain that engine until you can get a fresh one .