I keep having a problem with a leaking intake/exhaust manifold on my 261. My questions are: do I need to take the intake/exhaust apart to properly seat the two parts? I've had it planned down smooth but it still seems to leak. I have not separated the two units before planing or attempting to mount them. Anyone done this job successfully? I thought it would be easier and simpler to mount it as one. Should I take it apart and try it?

Help???