[waynieZ]

I'm having my headers coated and I need to figure how far from the end of the collector to stop the coating. There is only about 1/2" of room from the floor to the top of the collector so I doubt I coud get room for a V Band with clamp, so I'm going to use a slip joint and band clamp.
I had even thought of elongating the holes in the header flange in the back to try to drop the back of the header a little just to get some extra clearance. So my question is how much do I need to leave un coated so I can get a good seal from slipping the pipe over the collector? Which will have to stay un coated.