I recently rebuilt my /6 in a 70 Valiant. I replaced the points with EI and put a Carter BBD from a 318 on it. I'm having some problems with rough idling and it seems a bit sluggish from a dead stop when I nail it. I have the timing set at 8 BTDC and have replaced the vacuum pod on the distributor. The car is also eating my lunch in gas. The plugs are showing signs that it's running rich also. If I nail it and then let off quickly, it acts like it wants to die but then picks back up. Would a vacuum leak around the throttle shaft cause these problems? Is the 318 BBD too much for it to handle? I have the original BBD from the SUper 6 setup that I have yet to rebuild. What about replacing the coil with something hotter? It just has a stock coil on it now but I have not checked the primary and secondary resistance values yet.

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70 Valiant Super Six

sounds like the float has submarined
those things like to do that
could be a float level thing
remember you changed the angle the carb sits at
if it was close to to high then it would be

What is your total timing at cruise? Do you have your vacuum advance hooked up?

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It's a Slant thing. Even I don't understand.

1974 Duster, EFI /6 soon to be turbo...

Get that Monkay! Get that nasty thing!!

Does the timing mark move as you rev up the engine?
Have you checked your valve adjustment recently?
What happens when you plug the PCV valve?
DD

After replacing the vacuum pod, I hooked up my vacuum pump and noticed a that the timing mark did advance as I increased vacuum. It acts a little better from a dead stop now so I am assuming that it is now advancing properly. However, I have not checked my total advance at cruise. I have not adjusted the valves lately, so I'll try doing the running adjustment this week. Is there anything special I need to know before doing a running adjustment? I'll also check the PCV valve but I have also recently replaced it. What should it do when it is plugged?

What about using a hotter coil? Will that help my mileage? Which one should I use?

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70 Valiant Super Six

If you are going to use a 3/8 socket to adjust the valves, I would tape it to the extention. Those valves going up and down can knock it off and you don't want it falling down inside the motor.

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"Nothing in all creation is hidden from God's sight. Everything is uncovered and laid bare before the eyes of Him to whom we must give account."

I'm obviously doing something wrong or I've got a problem I just can't find. I adjusted the valves with the engine running and was able to quiet down some of the clatter. That did not help my idle problem. I plugged the PCV valve and the RPM increased for a moment and then settled back down. It acts like a vacuum leak but I can't find it either. Any more ideas??? I've got another carb I'm going to put on it to see if it makes a difference.

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70 Valiant Super Six

Check distributor cap contacts. If they are dirty it helps a lot if you clean them.

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Sorry, my english is not very good

One test is to cover the carb's throat during rough idle to see if the idle condition improves. (slowly close the carb flap is the way I do the test, you may have to back-off / disconnect the fast idle screw/cam)

If you can get the idle to improve by choking down the idle air flow, you have a lean idle condition caused by a vacuum leak or a clogged / lean idle circuit in the carb.

Have you done a compression test, are all cylinders even on compression?
DD