My 56 Imperial, which is still under restoration, starts quickly, does not smoke but the plugs foul with oil (and seemingly gas). I had it towed to a local garage where a recommended mechanic checked it over a couldn't find anything seriously wrong. He suggested I install an exhaust system (old system had been removed), and fix a broken heat tube (from exhaust manifold to auto choke on carb). His thoughts were that the lack of heat and back pressure was the culprit. I have done all the above with the same results. I have also changed the plugs (for the third time), installing the same plug used by a friend in the same (354) engine. I am at a loss as to what to do next and would appreciate any and all suggestions. The engine starts easily and runs OK for a while but then stars to make a "pop" sound, noticeable at the mufflers, as the RPM's increase. I'm confused as to why the plugs would foul but the engine doesn't smoke. Confused In PA Tom Shaw - 56 Imperial
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