Hi Drew I don’t have one of these engines but I would expect more than 15, probably 18. I would try leaning the mixture screws (winding them in) until the engine speed drops. Should improve the vacuum until it gets a bit jittery on the gauge, then wind out a bit to smooth it. Better yet, take it to a mechanic with an exhaust gas analyser and get them to set it to 14:1 air fuel ratio. I thought I had my Valiant (hemi 265) right with my vacuum gauge but got a gas analyser test afterwards and found just 1/16 of a turn of the screws made a big difference. Mine pulls a steady 20 inches. Haven’t had to touch those screws for 20 years since then! (Luckily, I was designing an emissions testing program for the government at the time so I could experiment on my car for free.) There is only so much you can do in your home garage without the diagnostic tools. Pay for a professional who knows what they are doing. About your lopsided exhaust, you probably have a bad spark plug or lead. Pull them out and have a look. Do a resistance test on the leads. I don’t know exactly what’s going on with your secondary carb. Could be a few things but it’s not much point going through them all from the other side of the world. It might be obvious if my head was under the hood. My advice is if you don’t know how or don’t have the tools, take it to a mechanic… Worth it in the long run. Fuel isn’t cheap to waste. Henry From: Drew W Carl <drew@xxxxxxxxxxxx> I am sending this to each person that replied to me individually. I have never quite figured replying in this server so that everyone doesn't have to see my emails over and over again so this is what seems the most logical. I got back to work on this yesterday. I verified the choke is coming off. I am starting to understand the high idle cam and it seems that the stop is still on that cam but just barely touching it. I did find the carb nuts slightly loose, one in particular was close to a full turn so I think I had a vacuum leak there causing a lot of my issues. I did put a vacuum gauge on the car and was fairly steady at 15 and climbed to around 18 with a little throttle so I am thinking I am okay there. After snugging down those bolts and following the directions Bob sent me on John Holt's site and I was able to get the car to idle at least though it is still a bit rough. I have a couple questions, the main one being what exactly are the mixture screws doing vs what the idle bypass screw is doing. The next is why are there two mixture screws? Should one be used differently than the others? Should they be used evenly? The car has never really run right and has always felt rich to me. It has always stumbled when the second carb kicks in pretty badly and takes a lot of throttle to come out of that stumble. I don't intend to race the car but it would be nice if it ran correctly. It also seems to guzzle fuel which would make sense with my thoughts that it runs rich. Another odd thing is it throws a ton of water and soot on startup, but only from one exhaust pipe not both. On 10/22/2024 12:07 PM, henry.schleimer@xxxxxxxxxxxxxxx wrote:
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