I've just changed my intake manifold and carb on my 305 lg4. My intake is a edelbrock performer and my carb is holley 600cfm. The carb is freshly rebuilt. The problem is i cant get my car idling right.Its running way too rich smoke is coming from the back. Now my question for you is first: is the carb to big for my stock lg4, second: could the jets on the carb been changed and are too big (hope this makes sence to you) if this is a possibility how can i check


help me out

thanks

 

I see you are from Canada, which means that your car is not computer controlled, right? If so, before you try re-jetting, make sure the carb is tuned properly. Hook up a vaccum guage to manifold vaccum, set idle speed at about 600 and tune from there. I think(correct me if I'm wrong) that the specs for tuning the 305 is somewhere around 15-20 @ 700 RPMs or somewhere around there. If you can get close to that, you should be idling alot better. If you can't solve the problem by tuning, then take a look at jet sizes.

 

yeah your right my car isnt computer controlled, is there a number on the jets so i can see if its the right ones if yes what number should i have. i herd they go from 66-99

 

Before you worry about the jets, make sure that the carburator is tuned properly and you have good vaccum at idle, then try the jets.

 

we tried everything to tune it and its still too rich what else could it be