Thread: 78 Trans Am getting some love

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I think I may have over carbed the engine, I maybe should have gone with the 650 cfm vs the 750 cfm. I have the jetting down as far as I can go with both needle and seat and the best I can get my AFR at 55-60 mph on a flat road is in the low 12's . While I had the carb apart I swapped the secondary jets to the smallest size at the same time because I could see the writing on the wall. I got that from a solid 10 to about a 11.5 at WOT still plenty rich and it's got a noticeably better pull than before better but I can still tell it's wondering what to do with all the gas at that point. I messed around with the timing from 34 -39 and it doesn't make much difference with the AFR. I'll call Holley and see what my options are at this point which I'm sure will be a smaller carb. On a side not I got my idle vacuum up to 16 and an AFR gauge is the best investment to make tuning a carb!

Have a safe and fun 4th everyone, I think we're going to take Rita out and drive around for the rest of the afternoon and try to find something to do. Most towns around here don't have much going on this year but It's a nice day for a drive anyway.