Leaky Exhaust

[What?]

Exhaust port gaskets are compression-type, like a spark plug gasket. This allows for the fact that headers are frequently not perfectly in line. Once used, they will rarely seal properly again.

[Milky]

Exhaust port gaskets are compression-type, like a spark plug gasket. This allows for the fact that headers are frequently not perfectly in line. Once used, they will rarely seal properly again.

I had the same problem when I changed my headers too... The gaskets in the 400 didnt look much like gaskets as they were rather dirty old copper things. I took them out and annealed them - softens the copper - and refitted with the same problem. The third? fourth? time I had taken the headers off I decided to rejuvinate the washers by a little judicious squeezing with a pair of needle-nose pliers. They looked much like flat copper washers when I removed them, and once reshaped and re-annealed, more like hulahoops or tubes. Refitted them and retightened the flange bolts in the way frosty describes and havent had a problem since.

^^me being a little too flash for KK's school of exhausts - he uses Sellys 'No More Gaps'™^^