i have a 330hp/350 crate with a holley 4160 600cfm carb. this is my first time with a carb and i'm not sure how to get the initial adjustments made. if anyone can give me some tips or hints i would really appreciate any help, thanx

I helped a buddy install a GM 350HO Deluxe this past summer....I guess we were lucky because the only Holley carb. adjustment we made was to the fast idle screw when we broke in the engine. He made a slight float adjustment a few days later. The carb. seemed (at least this unit) to be factory set. ??

[This message has been edited by black72 (edited 01-07-2002).]

thanks for your reply black72. i am new to carbs and i did adjust the floats until the fuel level was just below the sight opening on the side. i got this info from the holley website, since i made this adjustment the engine is backfiring almost constantly (only while in gear though) and the power is gone. i'm thinking that i am overloading with fuel now.

72-Elky...I am not a holley guy so I don't even know were to steer you on that,,,maybe another phone call to holleys tech line is in order. Sorry wish I knew more....maybe someone will bail you out and i can learn also from their post.

was the car on level ground when you adjusted the float. Make sure that the carb is actually level, as the motor is slightly tilted. jack up the back end a little until the carb is level, then set the float to where fuel only spills out when you shake the car. Too high a float setting will make it rich and too little will make it lean. hope this helps