Guy's what are y'all usin as a gasket/sealer between the header and block on your rear exhaust engines?
   Thanks a lot, Gil       

A good discussion on this topic can be found on page 3 of this forum under the title of "Header Screws Coming Loose", originally posted by yours truly. 

A good item to get for this is  The Aluminum tape (duct tape) that your heat and air pipes are wrapped in
It has a paper backing with sticky and it make a great easy gasket
Just clean stick it on the header and cut out the holes, then bolt up with a small amount of blue locktite

Randy

Except that the early Stalkers used two O-rings.  Problem is the O-rings heat up, get hard, and then leak.  Can't use gasket seal because the fit is very sloppy and the temp is too high.  I'm considering drilling a hole through and using a 4-40 bolt to keep everything together! (it will still leak).

Floyd

   Regular gasket goo will not work but certainly silicone sealant will stand the heat. A car exhaust header gets tremendously hotter than a model airplane header. A bigger problem would be getting it off afterwards. If you clean everything up correctly, that stuff is pretty tenacious.

   This sort of problem seems to be endemic with the Eastern European style engines. They all tend to have slip-on, or screw-on muffler attachments that self-destruct in relatively short order. As much problem as people have with good old ordinary through bolts/screw on conventional engines, there's no way that a screw-on or slip-on will work for long.

    Brett

Hi.

 Viton O-rings are good but even them tend to start leaking. Especially when there is only one seal. The rubber turns hard where it touches hot metal. I guess there are differend types and qualities of Viton.
 Tip: wrap the female-part of the fitting in the white plumber's tape (you know, the thin, white Teflon stuff that's difficult to handle). 2-3 layers is enough. Wrap it so that the edge of tape goes slightly over the corner, so it won't slip when pushed to the male part. This way the O-ring stays good for much longer. Also, the muffler is much easier to remove after a few hundred flights.
 I try to add a picture later to clarify. L

 Brett,

 Of course, you cannot trust the O-ring as the only means to keep the muffler in place. The Teflon tape does not help in that either, but as I wrote, it helps to keep the ring in a good shape for a longer time. And removing the muffler afterwards is easier. O-ring's purpose is to seal the connection (and in some cases to allow some movement in the joint). There must be other things to keep the things together.
 I use Retro's and they have a rear mounting bracket in the muffler. That prevents the silencer from falling off. Even when the rear mount is somehow flexible, it is important that the silencer is connected to the engine only via the O-ring, to allow some movement.
 I've seen Stalkers with a more solid engine/muffler connection and they seem to work too but I have no personal experience with them.
 Sorry about an unclear explanation. English is not my language. L   

Perhaps that didnt make sense.

Those older sytle mufflers had a spot where you can drill or tap out a hole to allow you to mount it at the rear of the muffler to a mounting plate also located at the rear of the take compartment.