>>     Paul-
    >>
    >>     Getting ready for the return of my engine, and I need to get
    >> the welding
    >>     on my exhaust reworked.  Based on prior discussions here on
    >> the  list, I
    >>     know I must get the exhaust tubes rewelded to the inside of the
    >>     mounting
    >>     flange.  Before doing this, though, do I need to remove the
    >> exterior
    >>     welds, or are welds on both the inside & outside acceptable?
    >>
    >>     Mark
    >>
    >>     The heat damage is done already to the metal alloy. Can you
    >>     shorten them about 3/8ths of an inch and just weld them on the
    >>     inside?  Are they 321 SS and .065 thick?
    >>
    >>
    >> I have no idea what the thickness or composition of the exhaust
   is --
    >> perhaps Jerry could comment since he fabbed them for me.
    >>
    >> As you can see in the pic, shortening the tubes is not in the
   cards -
    >> the body of the exhaust VAM is already less than 1/4" from the
    >> mounting
    >> bolts.  Right now I have to install the nuts while the flange is
   only
    >> partially mounted in order to get the nut to fit.  If I cut the
   tubes
    >> down at all, it would be impossible to mount.
    >>
    >> Also - I note in your 3D that you show the tube fully
   penetrating the
    >> mounting flange.  I believe in my muffler that the tube is
    >> surface-welded to the outside of the flange (no penetration at all)
    >>
    >> Given all this, am I correct in assuming that the tubes must be
    >> wholly
    >> replaced & the flange bored wider for new tubes?
    >>
    >> Mark
    >>
    >> OK then fabricate some braces up to the engine block.
    >> I'll do a 3D shortly. That will reduces the stress on the joints.
    >>
    >> Order a couple of these things from McMaster Carr.
    >> We will use the old intake manifold bolt holes.
    >> --
    >> Paul Lamar ...No rotor no motor.
    >
    > Mark, examine your exhaust.  I believe I welded it i all around on
    > the inside of the flange and tacked  it  on the outside.  This is
   the
    > way I have done them for years.  Jerry

   Mark, the inside weld was blended with a die grinder to better help
   exhaust gas flow.  You have to look closely.
   If in doubt measure the i.d. which is 1.875 for the two inch o.d.
   pipe.   I.D. of the exhaust flange is 2.25 inches.   Your entire
   system is 321 SS, .063 wall in case that comes up.  Are you piping
   outside air through the cool tube?  That will keep the entire system
   cooler and less prone to cracking (my theory)  Adding hangers is a
   good idea.    Jerry


Thanks, Jerry -- I'll take a close look at it this weekend.  Entirely
possible I missed it.  I will add the hangar straps regardless.  They
look like cheap insurance to me!

Mark


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