[77newell]

Mmmm, what I noticed is that the puffing at the breather outlet seemed to coincide with the knocking of the engine. The knocking sounds normal to me, but the volume out the breather SEEMS a bit much to me. I doubt it is smoke, though if it is as determined by odor that would indicate something really awry.

If this venting is blowby, then I would expect it to change with a change in engine speed. Is it normal? I don't know, but I would expect an engine of that vintage to be less expressive than this. If it was mine I would want someone with more expertise than I possess to look at it.