Thread: adjusting holley carb

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first of all what is a 350 bored a over. I had a freind come over to adjust mycarb. he adjusted set screws and both floats and now it runs worse . how do i adjust everything back right. I just cant get it set back right.

Originally posted by tlcwoodworks0
first of all what is a 350 bored a over. I had a freind come over to adjust mycarb. he adjusted set screws and both floats and now it runs worse . how do i adjust everything back right. I just cant get it set back right.

First off welcome to CHR tlcwoodworks

Have your friend come back & fix it?


It's been too many years since I've touched a Holley carb.
I'll take a stab @ it tho with my geezer memory and somebody else can come by later and give you the right info.

Remove the bowl level plug from the side of the bowl. Then while the car is running loosen the float level adjusting screw on the top of the bowl and adjust it so the fuel level is even with the bottom threads on the plug on the side of the bowl. Once that's done replace the plug and adjust the air adj. screws with a vac. gage to get Max vac.
As I said I haven't touched a Holley in about 35 years so don't try this until somebody confirms or flames my advise.


To answer your first question

"first of all what is a 350 bored a over"

You are probably referring to a 350 that has been bored to accept oversized pistons. Usually done to clean up worn cylinder bores.

Remove the bowl level plug from the side of the bowl. Then while the car is running loosen the float level adjusting screw on the top of the bowl and adjust it so the fuel level is even with the bottom threads on the plug on the side of the bowl. Once that's done replace the plug and adjust the air adj. screws with a vac. gage to get Max vac.
As I said I haven't touched a Holley in about 35 years so don't try this until somebody confirms or flames my advise.



i guess adj. carb. is like ridding a bike. the only other thing is be careful with running the motor, if the float is to high, gas comes out of the bowl plug like a river. you can put the plug back in each time , then run the motor then take the plug back out and check the level until you get it close.

Straight from the horses mouth

http://holley.com/HiOctn/TechServ/Te.../Instruct.html

Yea, that's what I meant to say.

Originally posted by pro70z28
Yea, that's what I meant to say.

yes i know he took the words right out of you mouth.

Originally posted by pro70z28
Yea, that's what I meant to say.

Just trying to save you some typing pro

Originally posted by viking
Just trying to save you some typing pro

I appreciate the assistance. I was hoping I wouldn't have to stay up all night typing this stuff. And the illustrations ........ man .......... don't get me started on the illustration time. Let's just say labor-intensive. He hE he

thanks for your help