Posted by ScottyHOMEy on August 23, 2009 at 17:05:24 from (64.222.222.179):
In Reply to: manifold questions posted by Rossputin on August 23, 2009 at 13:09:26:
Careful on that manifold if it's really scaled up and don't get too aggressive in cleaning it up. You've been around here long enough to see posts about the running problems cause by vacuum leaks (at the gaskets or from holes in the manifold). If it semms llike it's at all fagile and you want to save it, I'd suggest a very light cleaning with a stiff but soft brush, then treat it with a phosphoric acid solution like Ospho or Jasco. That will convert the iron oxide to iron phosphate and will stave off further rust (same concept as the bluing on a gun barrel). It won't have a like-new finish, but it will be black when you're done and might add some life before it ultimately has to be replaced.
Best thing to clean up the inside is to have it tuned right. Soot in the intake ports of the manifold is a whole other thing, but you should expect some on the exhaust side. Carb adjustments will cut down on the extra fuel making soot, but a good hot run, properly tuned, will keep the soot down in that area.
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