I went through this drill just last week. The back-center exhaust gasket on the Fenton setup was leaking after a couple hundred miles and at least one re-tightening. So I pulled it apart to change the gaskets. Scrape, scrape, scrape, cuss, scrape some more; it can be done in situ with the exhaust flanges connected, which are needed to support the manifold, otherwise you need three hands to reassemble it and you need the pipes to locate the angle of the exhaust manifold or else the flanges will leak. They ahve to be tight first. But that removal job wasn't so easy as I had outsmarted myself and put a bolt in the rearmost hole when I assembled it out of the truck. Once in the truck that bolt is almost inaccessible. After half an hour and some quality time with the grinder on a 9/16 wrench I was able to get it out. With the Fenton it seems to me that hole needs some sort of fastener as that rearmost gasket showed soot on part of it. I used a bolt on the front and it's accessible though requires removing the alternator. The manifold is probably warped but before I remove it completely for a trip to the machine shop I'll try some Remflex gaskets. I ordered yesterday from Summit Racing. They and Remflex have the same part number for 216 and 235, which bothers me as I know the port diameter is larger on 235s. We'll see in a couple of days.
