Yup, had that problem, had to fix it. When I used the thick asbestos gasket there was no problem. When I installed new Millenium cylinders on the plane I used the thin gaskets that came with the cylinders. On the first flight the #4 cylinder leaked causing the spark plug and cht probe to overheat. That resulted in meeting the crash truck which resulted in the FAA taking an interest in my engine. Cure the problem like this. Remove the pipe and take it to an automotive machine shop to have the flanges ground flat. Not all shops can do this work. The ones which have a large belt sander to flatten cylinder heads on cars can solve your problem. If you can watch the work being done you will see that the flanges that looked flat to you are in fact bent down at the flange ears. Reinstall with any suitable gasket and go fly. It seems to me that if the pipe was ever installed with the thick asbestos gasket you will need to do this work because the soft gaskets allow the flange ears to warp when you try to tighten the old gaskets. Good luck, Bob Condon
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