If you are using copper, why not just solder the joints?
As far as th left over copper pieces, I used hot water with a lot of pressure. Also, After I soldered evrything together, I let my manifold sit in a Bleach/Water solution for a couple of hours, then thoroughly rinse. Good luck and let us know how it comes out. Pics would be great!
You Can Give A Man A Fish and Feed Him For a Day, or You Can Teach Him To Fly Fish And Spoil Him For Life
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