StreetLethal92Z

I recently built my 350 into a 383. I decided to switch to carb because I heard you can get more horsepower out of it than TPI. Anyway I am having problems with the carb. Its a Holley 750 manual choke. I have the fuel cranked up quite a bit because I have a problem with it stumbling. It helped a lot but there is still a stumble in it. Also I fueled it out so much that now a lot of times it diesels on me. What I mean by diesel if you dont know is it still tries to run for a sec after I shut it off. Well anyway can anyone tell me how to tune this carb right so I wont have the stumble but I dont have to make it run so unbeleiveably RICH. Please help if you can. Thanks.

Jester

Ok that is a mistake right there. Carbs don't work like FI, increasing the fuel pressure will NOT get more fuel into the motor unless you over do it and blow the needle off the seat. You want it at 3-8 psi, no more.

By stumble you mean when you give it gas? Thats a badly tuned accelerator pump. Check the adjusting screw on the end of the pump arm. Make sure is has NO play between when you start to open the throttle, and when gas shoots out the squirters. If there is a delay, lengthen that screw till it goes away.

StreetLethal92Z

I already did that and it didnt seem to fix the problem. Anything else you can think of? I think I might try a bigger squirter. Think that could help? Thanks again.

FastBroker

This soundslike a good case for an LED O2 meter to aid in what is going on...