Try a Thicker oil in the Engine.....your muffler Bearing Seals are most likely shot.... thicker oil seals them up nicely! Matt Nall All Vairs! http://members.aol.com/patiomatt Lots of Corvair Technical info! ----- Original Message ----- From: <Vairdad at aol.com> > not sure what to do about muffler smoke. > Garland