i think my carb is way out of tune.

i have a holley 750 DP on a mildly built 350

the car starts awesome, but after it runs a while, it has a really bad starting problem. it smells like its running really rich, and when it finally starts a huge black cloud of smoke comes out of the exhaust.

the car also seems to bog for a very split second just off from idle.

i dont think the jets in the carb are stock, as i got the carb used...and it was on a very well built 383.

how should i start tuning it?

i've never even owned a holley DP, let alone try to tune one for performance


do these symtoms seem like tuning issues, or should i start looking for something else to make it start better when warmed up?

 

1) Check the float levels. Pull the sight plugs, start it up, adjust if necessary to just have fuel dribble out the bottom of the holes.

2) Buy a vacuum gage. You'll need to be able to watch the manifold vacuum while under the hood and while driving.

Look around on www.holley.com . They have more on what you'll need to do. Come back with any other questions you have.