John, my 149 did the same thing before the breakdown, and it would even blow the dipstick out sometimes, fogging me and everything around it with hot oil vapor... I figured that it was blowby, seeing as when my bore was miked out, it was .018 over from original bore diameter.
Hope this helps, Glen
Paul, look in the search feature, and you'll find some pics there, and i believe you can buy then on EPay. I'll look in my archives and see what i can do, if not, talk to Kraig, hes the master afterall.