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I am sceptical about the propane in the valve cover, too. I cannot imagine though, how I should get under the valley pan with anything. The suspected leak of the intake gasket mentioned by beanhead, could be underneath the valley pan and therefore inside the engine.

Please excuse my very late response! I finally found the problem!!! I performed some more testing as per your suggestion. When I wanted to remove the ignition cable boots, I ripped one apart. I thougt I was too stupid to do that, but when I took a closer look at the cable, I found a burnt spot...

I just thougt a bit about the issue mentioned by you guys and I totally agree with you. In theory, I could remove the PCV valve from the valve cover and insert a propane burner nozzle. When one of the intake runners does not seal right, it should suck the propane right in and I should be able to...

Now that you are saying it, the vacuum gauge is indeed a bit erratic (rapid bounce of about 1 inHg at idle). As soon as I raise the rpms just a little bit, I get a steady 20. I think I will check spark plugs first. Stem seals should be good, since the engine has about 300 miles on it, since it...

I have an electric fuel pump with 7psi max pressure and a volume of 80g/h. I use a fuel pressure regulator to lower the pressure and checked the surge with the engine just running from the carb bowls to eliminate any fuel pressure related problems. The power valve is about 4 weeks old, just like...

Thank you very much for your replies. I have a new, adjustable PCV-valve from Wagner, that is adjusted as per instructions. To exclude the PCV valve, I also performed a test with the PCV, the brake booster and the distributor (all vacuum sources hooked to the carb) removed (source by source)...

I also tried opening the secondary blades a little bit, which did not make a change except the idle speed. It still has this lean surging while cruising and during slight to normal acceleration (gets worse under load going up a hill). Under WOT it pulls good. Any help is highly appreciated!

I checked my timing today and I am at 15° initial at 700rpm idle speed and the total is all in with 36° at 2800rpm. At idle I had 14" vacuum today. I then raised the initial timing in 2° steps up to 20° and adjusted the idle speed to 700rpm accordingly. The vacuum stayed at 14". I then took it...

Idle rpm is about 700 rpm in neutral and drops to about 600-650 rpm in gear. I checked the pump arm adjustment but did not touch the squirter/cam. My thougts were that if it was the accelerator pump shot, it would rather be a hesitation than a non ending surge. Do you think changing cams would...

Thank you very much for your reply! The power valve is 6.5. I did not touch it, because according to my vacuum reading it already is slightly on the richer side, which is what the engine wants. With jets on the primary I went from the stock 68 to 70 and then to 72. Secondaries from 80 to 82...

Hi everyone, I've been reading on this forum for a long time now and finally have reached a point, I need to ask for your help. I have already read every single article that included the word “surge". I have a lean surge above 1500rpm that I am fighting for almost a year now. Specs: Fully...