I had the same problem last year. The people who refitted my engine managed to put the exhaust pipes into the wrong port of the silencer so the front pipe came up at an angle and never sealed with the results you mentioned.
I got a set of stainless nuts from Geoff Leigh in the Manchester area. I don't have his details but he appears to be well known in the circles.
In my case the stainless nuts didn't do the job and I had to get a second hand manifold from Spencer James. However, they are now very thin on the ground.
|