picked up some tungsten Carbide burrs for some head work I am doing and thought I would give them a run in on my old exhaust manifold.
cut out about 3/4 of a pint of material, port matched to the gaskets ,removed all the casting anomolies around the inside of the stupid three bolts turbo mounting points, opened up the runners on cylinder 2 and 3 9they get squeezed in the middle) and smoothed out the transition from head to manifold runner and from runner to turbo.
its not a chavy polished number but its just as smooth as the cast one was originally.
some areas are rough but should give you a bit more flow with a less restriction
cut out about 3/4 of a pint of material, port matched to the gaskets ,removed all the casting anomolies around the inside of the stupid three bolts turbo mounting points, opened up the runners on cylinder 2 and 3 9they get squeezed in the middle) and smoothed out the transition from head to manifold runner and from runner to turbo.
its not a chavy polished number but its just as smooth as the cast one was originally.
some areas are rough but should give you a bit more flow with a less restriction