Iam haveing trouble keeping my 71 exhaust from leaking, I have straight exhaust not the cheapest but Iam sure not the best.I can but them on no leak ,ride down the road and there leaking.I have tried copper coat and even high temp silicone but so far nothing works,has anyone had this problem?

 

Since the pipes just slip into the sleeves of the heads, it is almost impossible to keep them from leaking somewhat.
I have drilled a small hole in the head fin for the end of a brake spring to hook into. Then the spring is stretched a bit and the other end of the spring is held by a hose clamp around the exhaust pipe. This keeps the pipe pulled into the head (well, somewhat anyway).
It's really not worth the trouble to do however........... pg

 

Beercans are your friend. Cut a thin strip of a beer can and use it as a compression washer under the flange on the pipe. This will sometimes secure the pipe to the head and keep it from coming loose. What ever you do don't overtighten the clamp. They will strip out. JMFUO

 

Avoid Bud, Miller and Coors if you are the one who must consume the contents. FWIW, Dale's Pale Ale works well under these circumstances. Very nice, very hoppy.

Preaching the Good News of Good Beer, whenever possible.

Cutting extra slots in the pipe can help with the compression of the pipe onto the head spigot. Be sure not to cut too far down the pipe. If you cut past the depth that the spigot rotrudes, you'll have a permanent hole (leak). Good quality aircraft clamps, also called T-clamps will help with pipe compression as well. The original style clamps are pretty wimpy. If you get T-clamps, you probably want to avoid or change out any nyloc nuts, due to temperature concerns.

 

thanks for the advise, that will give me a good reason to try the pale ale but I wish Shiner Bock came in cans but alas only bottles. once again thanks for the responses