tickwon Posted May 15, 2002 Share Posted May 15, 2002 I was wondering if anyone ported a factory exhaust manifold? Can it be done? Do you know of anyone that can and if so where? I was looking at it and it looks pretty small. Thanks. Chris 1981 280 ZXT Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted May 21, 2002 Share Posted May 21, 2002 Probably the main area to port that you can get to easily is the turbine flange. To really do a good job of porting the inside, extrudehone is the only way to go, IMO. I think they get 550 to do a cast iron manifold. I have used a dremel tool and some of those sanding rolls to smooth out things on another manifold after I had a T4 flange welded on since it is round from Turbonetics, and the turbo I had was square. I did alot of grinding. I would smooth out any sharp break you see and can reach and roll over any corners and try to smooth out as much of the roughness in there. I would like to figure out a way to grind out those humps that protrude into each runner, but they are for bolt clearance, so I am not so sure about that. Hope you are patient. Grinding cast iron takes a little while. Quote Link to comment Share on other sites More sharing options...
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