KevFF21
Your 206 (206.8 aka 207) was part of a rapidly changing I-L OHV Six engine design from Chevrolet. Sometimes it's hard to get good reference on those 1934-36 engines because there is not a lot of online manuals for that 1936 version(my print versions don't have much specifically on that 36' engine either). The way those 1934'-36' engines got their engine lubrication was swiftly changing.
My knowledge of that 1936 motor is very limited , and I was thinking there was a "screw-like " object under the ignition distributor on the block casting (above the oil pan mount seam)
Regardless, glad to hear you did not have to resort to some drastic immolation of that road draft/oil fill tube just to get it clean
I wish I could help more with that 206 1936, perhaps your question would have been better directed to the "Engine Shop" section of this forum instead of the "Electrical Bay" part of this forum. There is surely some Stovebolters out there who have a better grasp of your unique 206 engine and the way that ignition distributor mounts in the engine casting block.
You can always double-check your engine crankcase oil level, and any other "vents" (like valve cover) to eliminate those from the problem. Finally does your engine ignition distributor have that little "grease cup" hanging off the side that adds grease to lube the ig. distributor shaft ?
