Im running a 670cfm holley street avenger on my 350. It is definetly getting to much fuel. I need to go down a couple steps on the jets. My question is...which jets do I have right now? Im gonna try going down 2 jets and see what the car does. Other than fouling plugs the car runs really good. Im probably loosing MPG tho...and some power. Least I know im not running lean lol.

 

Before we talk jets, let's establish a few other things first:

How are you delivering fuel, and controlling pressure? Are the float levels set correctly? What distributor are you using?

As to jets, I don't know what size is in there now. But, a good investment is the Holley Jet Assortment Kit, which has 2 of each size from 66 to 99. You won't use them all, but you'll have everything you can use, and if you get more than a few pairs, you'll spend close to what the assortment will cost you.

 

This is tbi305camaro BTW.

I havent touched the floats. I have a mallory fuel pressure regulator putting out 5.5 PSI. The carb is just as it was when I bolted it on.

Im no carb expert yet so I may take it and have it adjusted this time.

Im using a brand new proform distributor. HEI. brand new coil, cap, rotor came with it. After the tranny install I ran the car for maybe 5 min total and the brand new r45TSs are already fouled out.