I have smoke coming out of my oil filler tube and the intake (only when the air breather off). The oil filler cap isn't a regular one, I bought this motor from boyces so I'm guessing it's some military cap. But it looks like a miniature keg in shape, and it's a little bigger than an injector in size. But I'm getting a smoke or smog that comes out of it when I shut the truck off. The smoke isn't "bulky" like what would usually come out of the tailpipe. It's more like the smoke that comes off the end of a lit cigarette. I'm not sure if this from blow by or not. Also I'm not sure how much blow by would indicate a problem.